GTA
All Springer/NP/PCP Air Gun Discussion General => European/Asian Air Gun Gates => China/Asian AirGun Gate => Topic started by: Methuselah on February 05, 2024, 05:15:46 PM
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(WARNING, LONG READ)
First, I just got it a few odd days ago. It was Mike's last one in .177, so I figured either get one in .22 or expect the .177 might be a little rough around the edges.
It was to be tuned, and setting was talked about and I gave it some thrashing around on the phone, that it was to be accurate and back yard friendly. That said, he did talk me out of having it adjusted for low fps and heavier than normal trigger. After all, I got used to the Daisy 880 that was 6#...
So, I've fired it once this weekend at a target about 25' away. Hopefully I'll remember to post the target. It didn't do terrible, maybe .69" with more spread up and down than side to side. Potential is definately there. The stock has a crack at the butt maybe 4" long iirc, and the bolt is really a lot harder to pull back than I thought it would be. It's a $150 gun that's had tuning services worth more than the gun, so I'm thinking I'm way ahead.
It had been fired enough to record some numbers:
Full Power
RWS Hobby - 791
AA 8.4 gr. - 740
Crosman 10.5 gr. - 675
at 68 deg. F.
Accuracy test good
OK, full power. Mike did tell me how to adjust it, but I was thinking lower for less report and better cartridge count.
I wrote Mike back and gave him a piece of my mind :-), telling him I was very pleased and the trigger was perfect too. It's 2# 3 oz., 2# 5 oz. It's pretty loud however and one of my neighbors is the preverbial NFH, so I reckon I'll see how it breaks in, and try some better ammo before trying to adjust it for lower fps.
My (only) group was ten rounds, CPHP's, of course irons. I don't plan on scoping it, but I suppose that may have to change because I don't see a way to quiet it at the muzzle witout getting rid of the front sight (question 1, can you)?
I've gone to YouTube for disassembly and find you have few vids, all for the QB78/79 which have the same (question 2) trigger group. Nobody did the fps adjustment online and I don't see it here by searching XS60 or QB78 (question 3 --- did I overlook it?).
So I said I wrote Mike. He tells me it needs about 200 shots to settle in, and try feeding it 5.52 H&N's. I don't have much premium ammo, but I have almost one full tin of those.
All in all I wanted my next airgun to be tuned, and I'm tickled pink with what I gots. (THANKS MIKE)
I'm going to put some more of the CPHP's through it for break in, and have about 20 so far. I'm a bit jelous some of the earlier comments of these had LW barrels and reports of same-hole performance at hunting ranges, but who's to say I won't see that. I am impatient and would like to use it with cheaper ammo though, so I suppose it's possible I may lapp the barrel - I reckon we'll just have to see how that goes though as it won't be any time soon.
Is there a dissassembly video or thread around covering digging in as far as a barrel change? I found only one, super long, super boring brit that seemingly built his own tool for pulling the vale body. It had a good tip about not letting the trigger adjusting screw hit the stock on reassembly (shorten that screw, presumably Mike already did).
Again --- THANK YOU MIKE :-)
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Amazing little gun!! I got one in .177 for my wife's birthday a couple years ago and she immediately fell in love with it. It is amazingly accurate capable of one hole accuracy with open sights. Who'd a thunk? Hers is set for maximum shots and seems to hold gas forever. (It does eventually run out.) Beautiful gun with no noticeable flaws. Bolt operates smoothly. What's not to love?
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Amazing little gun!! I got one in .177 for my wife's birthday a couple years ago and she immediately fell in love with it. It is amazingly accurate capable of one hole accuracy with open sights. Who'd a thunk? Hers is set for maximum shots and seems to hold gas forever. (It does eventually run out.) Beautiful gun with no noticeable flaws. Bolt operates smoothly. What's not to love?
Nice, yes!
I'm already looking for an excuse to have one in .22 caliber
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Ftt 4.52s are 8.99 at field supply if that's what it likes and price is a concern.
X3 on Mike is good, buy with confidence
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So, "progress", a couple more rounds fired, 23 total including the count on the paper with velocities when Mike chrono'd it --- gun went "click" when I pulled the trigger last night.
I e-mailed Mike for suggestions, he said it's empty. Since it also said "Accuracy OK" on the little report that came with it I reckon the count is higher but I did expect it would vent some since the last shot fired the day before wasn't quiet.
I did mess with the cap, it's got a gizmo for bleeding off the charge, and read up some on it, there can be issues. Got PM'd with a suggestion to buy an aftermarket cap without that gizmo, perhaps I will. For now though, I'm going to load one new cartridge (and one spent), inspect the bleed mech, and perhaps let it sit a week with some zip lock bags or saran wrap "bagged" over muzzle and cap to see if it holds CO2.
I find info on XISICO XS60S almost nonexistant, but some on QB78 and Umarex Fusion. Are there others that share the valve and trigger group?
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So, I've been reading (mostly qb78) and seeing a lot of folks had or have issues with leaks and that it's usually the cap.
I expected my rifle to shoot weak and when opening the bleed it didn't vent anything.
I wiped and brushed out the bleed valve assembly, which becomes accessible after unscrewing the "piercing cylinder". Then added a smidgen of pelgun oil to seal and o-ring.
With one cartridge and two balloons, I expect to know more tomorrow.
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Next morning
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I have had my XS60-C for quite a while (August 2017) and am probably responsible for many others here getting one. ;)
I LOVE this gun and have been singing it's praises every since!
I don't think a QB-78 is a good guide as it is a clone of the vintage Crosman 160... However the early Fusion and the XS60 are sisters ;)
Here is the day I got her from Mike... dependable as an anvil still today.
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I have had my XS60-C for quite a while (August 2017) and am probably responsible for many others here getting one. ;)
I LOVE this gun and have been singing it's praises every since!
I don't think a QB-78 is a good guide as it is a clone of the vintage Crosman 160... However the early Fusion and the XS60 are sisters ;)
Here is the day I got her from Mike... dependable as an anvil still today.
Thanks for pic Scott :D
Mike very kindly also included the front bracket to a D34 clone.
I agree, it's one heck of a nice rifle, and, you probably influenced my purchase. Mine came without scope, but he did ask if I planned to scope it and I told him I was very much hoping to use the irons.
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2nd cartridge, loaded 1 spent, 1 new. 1 piercing shot, one fouling shot.
First low loner, 2nd and 3rd ccw, next 7 grouped.
Mike DID tell me not to shoot CPHP's, I'm just trying to put some break in lead in the barrel...
Still 25'.
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As Mike told you CPHP's are not a good judge of character.
If you want to break it it in, they are ... well, OK.
But don't judge it's performance by them.
Get you something from H&N, JSB, or RWS... in a heavy weight for that tune. ;)
Your post made me dig out my '60
Been months in the safe and she still held a charge. ;D
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As Mike told you CPHP's are not a good judge of character.
If you want to break it it in, they are ... well, OK.
But don't judge it's performance by them.
Get you something from H&N, JSB, or RWS... in a heavy weight for that tune. ;)
Your post made me dig out my '60
Been months in the safe and she still held a charge. ;D
I know you're right Scott. I've probably got most of what you suggested.
AAMOF, 15 yards, one shot, FTT - dead center hit.
I'm just taking my time ... wanted to see if it holds CO2 first and let the mechanicals settle in.
You could post a target... ;)
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As Mike told you CPHP's are not a good judge of character.
If you want to break it it in, they are ... well, OK.
But don't judge it's performance by them.
Get you something from H&N, JSB, or RWS... in a heavy weight for that tune. ;)
Your post made me dig out my '60
Been months in the safe and she still held a charge. ;D
I know you're right Scott. I've probably got most of what you suggested.
AAMOF, 15 yards, one shot, FTT - dead center hit.
I'm just taking my time ... wanted to see if it holds CO2 first and let the mechanicals settle in.
You could post a target... ;)
I might have some XS 60c targets posted in the hunting gate ;)
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A co2 gun I got from Mike came with upgraded orings he installed, including in the cap. Different gun than yours. Mine's a qb family gun. No leaking issues with the qb family gun from mike. The qb gun I didn't get from mike has needed new orings and had leaks a couple times.
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You could post a target... ;)
This is one I have on file from back in the day that is relevant to my point...30 yards.
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Mine was the answer to a rabbit issue at 25 yards DRT with significant brain damage, shooting 16gr Poly-Mags.
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A co2 gun I got from Mike came with upgraded orings he installed, including in the cap. Different gun than yours. Mine's a qb family gun. No leaking issues with the qb family gun from mike. The qb gun I didn't get from mike has needed new orings and had leaks a couple times.
So far 15 shots on a single cartridge, last one sounded anemic (full power tune), miss at 15 yards with h&N ftt. Still talking break in though.
(Holding my breath...)
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You could post a target... ;)
This is one I have on file from back in the day that is relevant to my point...30 yards.
Nice :D
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Mine was the answer to a rabbit issue at 25 yards DRT with significant brain damage, shooting 16gr Poly-Mags.
Polymags ;D
I have them in .25 cal, might just get some!
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Again 25', H&N FTT 5.52, around 20 to 30 count in one cartridge, 10 rounds. First went high, just left of group rested on hand on bag, other at low left is a mystery flyer. Frustrating, but 200 rounds for break in, ok.
Modify still works ... shot 17: 582 fps, shot 31 (after that group): 464 fps.
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Shot 41, 399 fps (CPUM). Mike wrote 675.
Interesting POA hardly changed at 25'. It's a LOT quieter now.
I think I'll wait a week and crony shot 42. Probably should change out CO2 cartridges after that, calculated 3.7 ft pounds...
(What do I need, 2 ft pounds for a HOSP?)
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The XS60C is a great gun, I have one of the ones that Mike converted to PCP way back when and I love it, it's still one of my favorites, very light and agile for woods work and quiet as a church mouse with the correct muffler...
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(What do I need, 2 ft pounds for a HOSP?)
grobe1458 Posted in 2013 quotes of 2.0 and 2.5 ft-lbs for a sparrow. Pellet choice and caliber might cause some variation. Hope this link works, it has a lot of good information.
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The XS60C is a great gun, I have one of the ones that Mike converted to PCP way back when and I love it, it's still one of my favorites, very light and agile for woods work and quiet as a church mouse with the correct muffler...
Mine still has the original *BARK* and I love it. It's one of the few .22 guns I own that shoot my cast pellets really well. That 24gr pellet hits hard.
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The XS60C is a great gun, I have one of the ones that Mike converted to PCP way back when and I love it, it's still one of my favorites, very light and agile for woods work and quiet as a church mouse with the correct muffler...
Mine still has the original *BARK* and I love it. It's one of the few .22 guns I own that shoot my cast pellets really well. That 24gr pellet hits hard.
Let mine bark also, it impresses the powder burner people ;)
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You're testing my memory a bit. Going back 10 years, I tested a Umarex Fusion, which is the same as the XS60. Here's the review:
https://hardairmagazine.com/reviews/airgun-test-reviews/ham-test-review-umarex-fusion-air-rifle-177-cal/
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I picked up a Fusion 2 converted to HPA not a bad shooter, took many chippers and HOSP with it to date, even shoots slugs ;) Still like the XS60 better :)
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even shoots slugs ;)
You shot slugs through it, or shot pellets at slugs, or shot slugs at slugs? 😂 Sorry for the bad joke, I could not resist. The XS60 might be my next purchase.
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even shoots slugs ;)
You shot slugs through it, or shot pellets at slugs, or shot slugs at slugs? 😂 Sorry for the bad joke, I could not resist. The XS60 might be my next purchase.
LOL I thought that may happen after I posted, answer is D all of the above ;)
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The XS60C is a great gun, I have one of the ones that Mike converted to PCP way back when and I love it, it's still one of my favorites, very light and agile for woods work and quiet as a church mouse with the correct muffler...
Mine still has the original *BARK* and I love it. It's one of the few .22 guns I own that shoot my cast pellets really well. That 24gr pellet hits hard.
Let mine bark also, it impresses the powder burner people ;)
I use mine in the woods taking down tree chicken, I want it quiet...
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The XS60C is a great gun, I have one of the ones that Mike converted to PCP way back when and I love it, it's still one of my favorites, very light and agile for woods work and quiet as a church mouse with the correct muffler...
Mine still has the original *BARK* and I love it. It's one of the few .22 guns I own that shoot my cast pellets really well. That 24gr pellet hits hard.
Let mine bark also, it impresses the powder burner people ;)
I use mine in the woods taking down tree chicken, I want it quiet...
I have been hunting squirrel with louder guns this season, shots seem to not spook them, and by now they should know better ;) Also the deer do not rush off but meander just ahead of us while hunting tree rats ???
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Folks been successfully hunting squirrels with .22sr and lr for years. They don't moderate those.
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Today's makes one week its been sitting.
Next shot chrono, CPUM, 270 fps., next 277 fps. Just in case I didn't recall the pellets used last time, tried next with CPHP, 259 fps. - this would have to be higher if I made that mistake - it's a lighter pellet.
So, it lost 120 fps just sitting a week, from 399 to 277.
Sadly, nothing new to me, of the ten airguns I bought new none have been both accurate and long-lived. I had better luck with the firearms, a Ruger 10/22 works and is not too bad accuracy wise with a few shells, and a 17 hmr is decent (batting 50% on new powder burner purchases).
I bought this one because I've never owned a tuned gun, and so many people said it was both accurate and held CO2 for several months. No surprise if there was one that didn't measure up I'd land at my door.
I'm going to say loud and clear, here in writing, that I believe the majority of these that get worked through by Mike (95% or higher?) don't have issues, many are accurate with cheapo pellets, and if not, he seems to be adamant about standing behind them and would probably refund me or cover return/repair. It's just, well, my luck:
Daisy 880 - OK accuracy
Hatsan 125 - swarf cut seal, lockup pin undersized
Remington Express - bad seal
Diana 34 - I've beat this story to death...
Daisy 415 CO2 pistols X2 - gave away, under $5 each
Daisy 408 - leaks CO2, trying teflon tape...
Crosman 1377 - fixed minor issues, accurate!
Crosman C2023 - returned, seal gave up
Flying Dragon XISICO XS60C - Tenth new gun, batting 0
My luck, there's no point. If there's one in a thousand chance for something to go wrong, I'd be first in line for that 1 in a thousand ticket.
I reckon my choices are to put it up for trade or sale, request a refund (and offer to eat the return shipping probably), or tear it down and try a re-seal - maybe plugging the valve gasketing for bleeding the depleted cartridges.
Of course there's also the add it to the list of projects pile, as I did say it was loud and I wanted to lower the fps. I reckon you lighten the hammer spring to do this? It should hold gas short-term (a day?) since it took 7 days to drop the 120 fps...
Did I say I bought it to avoid these situations? Yeah. Same reason I bought that C2023. Yeah, that's right.
So I should sign off this thread, but if you want to comment I'll be here ;-)
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Today's makes one week its been sitting.
Next shot chrono, CPUM, 270 fps., next 277 fps. Just in case I didn't recall the pellets used last time, tried next with CPHP, 259 fps. - this would have to be higher if I made that mistake - it's a lighter pellet.
So, it lost 120 fps just sitting a week, from 399 to 277.
So I should sign off this thread, but if you want to comment I'll be here ;-)
If that is with fresh cart(s) and ambient temp above 65f ,something ain't right.
Call Mike.
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Sounds to me that the gas is just about out with those velocities., not enough pressure to push the seals home???? soapy water will find the source when there is a leak...
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MIKE!!!!
(https://lh3.googleusercontent.com/proxy/rfSpO-9-mz8kOH43jYowY7oaTmlbMSsT5_EfVxwmBHumjX2sWtYhSsz_NMd9Jz-uBzP_vn04Rhs9gxtNOtPfFZRi-TvTjcT6PQigfuYBAw1ujarw)
I am humbled to your presence
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Today's makes one week its been sitting.
Next shot chrono, CPUM, 270 fps., next 277 fps. Just in case I didn't recall the pellets used last time, tried next with CPHP, 259 fps. - this would have to be higher if I made that mistake - it's a lighter pellet.
So, it lost 120 fps just sitting a week, from 399 to 277.
So I should sign off this thread, but if you want to comment I'll be here ;-)
If that is with fresh cart(s) and ambient temp above 65f ,something ain't right.
Call Mike.
Scott,
All continuous, whole thread. Shots 41 thru 43 with only one cartridge, a week between shot 41 and 42/43, 399 fps on shot 41.
My guess is it will break in, it will shoot good and accurately when it settles in, but keeping it is probably a bad idea because I just don't shoot often enough to throw two cartridges into it every shooting session, and as much as I'm willing to work on something, I just don't get to doing it anytime soon.
The last major rework was a couple years ago on a Henry H001 that has a very nice stock --- it could have been sent back to the factory, but I didn't want to chance a lesser stock if they replaced the gun. It had (has) concentric chatter marks all down the barrel and didn't like any of the almost two dozen rounds tried. It seems to like everything after I worked on it, but no telling if this one has the same potential.
Maybe I will call Mike, perhaps a new cap is all it needs (if he would send a new seal [for this cap] I could cut off the old one and polish the brass valve piece).
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Sounds to me that the gas is just about out with those velocities., not enough pressure to push the seals home???? soapy water will find the source when there is a leak...
Mike,
THANK YOU FOR CHIMING IN!!!!!!!!!!!!!!!
I tried the balloons trick and you are 100% spot on right I have not thought this through well enough yet. Agreed 1000%, probably not enough gas pressure left, certainly not a usable range for shooting, makes sense not enough to count on for the valving either.
I owe you an apology, I should have called for your (expert!) advice before posting pretty much meaningless "results"!
I hope you will still sell me one of these in .22 caliber when I'm ready...
Thanks Again!
Steve
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MIKE!!!!
(https://lh3.googleusercontent.com/proxy/rfSpO-9-mz8kOH43jYowY7oaTmlbMSsT5_EfVxwmBHumjX2sWtYhSsz_NMd9Jz-uBzP_vn04Rhs9gxtNOtPfFZRi-TvTjcT6PQigfuYBAw1ujarw)
I am humbled to your presence
(Ditto)
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Today's makes one week its been sitting.
Next shot chrono, CPUM, 270 fps., next 277 fps. Just in case I didn't recall the pellets used last time, tried next with CPHP, 259 fps. - this would have to be higher if I made that mistake - it's a lighter pellet.
So, it lost 120 fps just sitting a week, from 399 to 277.
Sadly, nothing new to me, of the ten airguns I bought new none have been both accurate and long-lived. I had better luck with the firearms, a Ruger 10/22 works and is not too bad accuracy wise with a few shells, and a 17 hmr is decent (batting 50% on new powder burner purchases).
I bought this one because I've never owned a tuned gun, and so many people said it was both accurate and held CO2 for several months. No surprise if there was one that didn't measure up I'd land at my door.
I'm going to say loud and clear, here in writing, that I believe the majority of these that get worked through by Mike (95% or higher?) don't have issues, many are accurate with cheapo pellets, and if not, he seems to be adamant about standing behind them and would probably refund me or cover return/repair. It's just, well, my luck:
Daisy 880 - OK accuracy
Hatsan 125 - swarf cut seal, lockup pin undersized
Remington Express - bad seal
Diana 34 - I've beat this story to death...
Daisy 415 CO2 pistols X2 - gave away, under $5 each
Daisy 408 - leaks CO2, trying teflon tape...
Crosman 1377 - fixed minor issues, accurate!
Crosman C2023 - returned, seal gave up
Flying Dragon XISICO XS60C - Tenth new gun, batting 0
My luck, there's no point. If there's one in a thousand chance for something to go wrong, I'd be first in line for that 1 in a thousand ticket.
I reckon my choices are to put it up for trade or sale, request a refund (and offer to eat the return shipping probably), or tear it down and try a re-seal - maybe plugging the valve gasketing for bleeding the depleted cartridges.
Of course there's also the add it to the list of projects pile, as I did say it was loud and I wanted to lower the fps. I reckon you lighten the hammer spring to do this? It should hold gas short-term (a day?) since it took 7 days to drop the 120 fps...
Did I say I bought it to avoid these situations? Yeah. Same reason I bought that C2023. Yeah, that's right.
So I should sign off this thread, but if you want to comment I'll be here ;-)
With foot firmly in mouth I wrote off this TUNED airgun without due process. Disrespectful the way I wrote this!
Mike replied in spite of my shortcomings. Class act. Class act!
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Just for reference I have a Hatsan pistol that will leak down if I leave it below 150 bar, it just started this, if I fill to 200 bar it holds for weeks.
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Just for reference I have a Hatsan pistol that will leak down if I leave it below 150 bar, it just started this, if I fill to 200 bar it holds for weeks.
A stiffer spring, alternative material, elimination, etc. at this bleed valve might be a good workaround for disassembly and polishing. Just leaving it alone, I'd expect a little wear-in over time to make it hold better at lower and lower threshold. However, as Mike graciously pointed out, it was unreasonable for me to expect it to hold at pressure well below its design. The more pressure the better the seal. And OF COUSE Mike was right to (eloquently) point out you're not using the rifle at 400 fps with expended cartridges.
I just hope nobody reads what I wrote and thinks there is anything wrong with this model - it was simple ignorance on my part.
As to 150 bar leaking now when it used to hold before, if there is similar valving design, a weakened spring, fowled seat, worn seal material ... , well, I reckon you know a lot more than I do ... point taken, thanks James
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Yes 10 year old seals are showing signs in my case.
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I haven't been shooting it bc I consider it too loud for the back yard, but I loaded two cartridges in it yesterday and attempted to get it sighted in. Still under the breakin shot count, and no idea if the Chinese Win Domed are "suitable", but it prints small groups at 10 yards, hits pretty much what I aim at using the irons at 25 yards.
Only thing is I had to jack the rear sight almost all the way left, and the first two or three rounds were high and worked their way back down. I ran it over the crony before the last salvo, then fired until it settled, and took a 2nd read - matched exactly, 651.6 fps. Not sure what that's trying to tell me. Front sight leans right, so I presume centering it will put the rear sight closer to center...
The rear green optic fibers are very dim, reckon I'll remove them and order some red ones since the front is very visible.
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Two more cartridges, I think the recommendation was a couple hundred break in rounds. Still Chinese Winchester Round Nose, 20 rounds, 10 at each target. Was at the pistol range as a guest (otherwise only open on weekends). Next to me, 9 mm auto going off so paused when firing. I suspect the flyers are either first round or first after delay for the 9 mm nearby.
Several extra pauses on target #2 while we exchanged some stories.
When I finish these two cartridges it will be around 200 pellets. Outside of the inner red ring is just under one inch. I didn't measure the groups and haven't ordered/replaced the green optic fibers yet.
(as usual, type using laptop's keyboard, edit and add pics from cellphone)
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Got the recommended 200 or so pellets down range.
Didn't take the pic, but tried RWS superdomes at about 13 unmeasured yards, first shot low probably because only one cartridge as second one is not pierced until after first firing. Interesting as I thought it would have been full pressure (?). Rest were grouping pretty tightly but didn't take the picture.
Not sure if it was magic number break in or it doesn't like the CPHP, Win Domed, and H&N FTT's in 4.52 but it may be time to add a scope and see if it's as accurate as I think it is.
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Looking forward to it. What range are you thinking?
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That's some nice shooting with irons! Looks like your foresight might be a bit tweaked. If the cartridges are not punctured reliably try placing a dime between the carts when installing fresh carts. People have reported that some brands of carts won't reliably puncture in the gun.
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That's some nice shooting with irons! Looks like your foresight might be a bit tweaked. If the cartridges are not punctured reliably try placing a dime between the carts when installing fresh carts. People have reported that some brands of carts won't reliably puncture in the gun.
Thanks.
Tightening the cap punctures one cartridge, firing punctures the second one.
This was the target with the superdomes.
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Looking forward to it. What range are you thinking?
Usually start at 10 due to NFH, then move to 25 if 10 was OK.
I wish I had taken my time with that group, it was better than I was expecting
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Norma golden trophy ft heavy pellets were recommended on the bargain gate. Tried them, below pics, not bad.
Also wrote and called MM, hoping to buy a new seal for the cap. No luck. Anybody heard from him lately? I hope it's not health issues!
Pics
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IIR any paintball bottle oring would work, might be able to match one up a a local hardware also, Mike may be on vacation, and IIr best to call between 10 and noon.
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IIR any paintball bottle oring would work, might be able to match one up a a local hardware also, Mike may be on vacation, and IIr best to call between 10 and noon.
I reckon I'll have to try calling again when you suggested, thanks James.
Hope I do this right, it's this seal...
https://www.gatewaytoairguns.org/GTA/index.php?topic=212783.msg156516041#msg156516041
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IIR any paintball bottle oring would work, might be able to match one up a a local hardware also, Mike may be on vacation, and IIr best to call between 10 and noon.
I reckon I'll have to try calling again when you suggested, thanks James.
Hope I do this right, it's this seal... (https://www.gatewaytoairguns.org/GTA/index.php?action=dlattach;topic=212783.0;attach=451749;image)
https://www.gatewaytoairguns.org/GTA/index.php?topic=212783.msg156516041#msg156516041
OK I had the large Oring in mind that goes on the threaded cap.
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The finish on it is kinda poor, it's the degassing valve and I'd likely have to destroy it to get it off so I can polish the brass where it seats.
The other end seals against plastic, no clue how to improve upon that.
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If I have any criticism of the XS60C it is the degassing valve. :P
Mike was shipping the guns with a plain 2240 style cap as well as the degassing cap when I bought mine. I quickly decided that it was too finicky for me.
If you can get the plain style cap IMO it's a better proposition.
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I have a fairly new 2260 (still holding gas after a couple months...)