Any US importers carrying this gun?

[stretch]

I just bought a JSB pellet sample kit and mine also seems to hate JSB pellets, especially those with less than 5.52 skirt diameter.

Do you mean head diameter?  The skirts should always be quite a bit larger than that, usually larger than 5.6mm in my experience.  Some I just checked were 5.64 - 5.66mm for example.

Sorry, you're probably correct.  I just noticed that in the pellet description some were labeled as "5.50mm" while the ones that gave me slightly better groups were labeled "5.52mm".

[Abefroman]

Hmm.  I think I was shooting 5.53's I got from pyramid, but I ordered 3 tins of H&N Barracudas from amazon and they are probably smaller head diameter than 5.53.  I'll have to shoot those and see how they group.

How do I smooth down / taper the leade to bore ledge ?  dp I need to use some kind of tapered dowl or something?  do you twist it in the barrel or

[nervoustrigger]

How do I smooth down / taper the leade to bore ledge ?  dp I need to use some kind of tapered dowl or something?  do you twist it in the barrel or

treat the leade->bore transition -  A picture is in order: (thanks to Kirby)


Knock down the sharp transition between the leade and the bore.  A regimen of 320, 400, and 600 grit is good for this operation.  Wrap the paper around a small dowel and sweep it in and out, applying pressure all around the perimeter. 

Or some folks like to do it with a Cratex point.  They are rubberized grinding/polishing points impregnated with an abrasive.  You can shape the diameter to fit the leade and shape the point with a taper so it will bevel the leading edge of the rifling.

Either way, the goal is to make it so the pellet can ease up into the rifling without getting gouged.

[darkcharisma]

Thanks for the info. Troy Hammer is looking at making a HS adjuster and possibly a steel TP wheel so that we can safely open the TP without fear of failure. Troy did mention that there is a shelf on either side of the TP wheel opening that could possibly limit how large of a diameter the new bolt/wheel can be. I'm waiting on his findings and will report ASAP.

Nice work on the Guantlet.

The Wheel measures .275 or 7mm. looking throught the wheel port sideways, you can see the upper section which is where the barrel sits. pretty thin section. dont go larger than .299 for the wheel size. i feel its as good at 7mm for up to .217 TP which i also made out of o1. it gets pretty thin but o1 heat treated will last for a long while if not forever. heres comparison for 3/16 vs .217...tell Troy to not heat treat so you can port larger if needed.

[Hawkeye51]

Mike, the 52yrd group that you posted looks great!  Your making some real progress. What "fps" are the different pellets being shot at?  Nervous is correct in that some pellets like a slightly slower speed @ a given twist rate. Following your progress with the anticipation that you will end up with a great shooter.

Darkcharism, that's some awesome work you do!!!

[kzz1kaw]

Mike
Did you try the light test with the pellet in the bore? Barrel has to be removed from the action. You should not see any light as you push the pellet through the length of the barrel

[nervoustrigger]

It's pretty easy to feel loose and tight spots when pushing a pellet through with a cleaning rod.  Within some reasonable limits, it's okay to be loose throughout the middle, just not at the muzzle.  Same concept as a choke.

Without a blast of air to make the skirt obturate, you'll see light weeping around any pellet you insert.

[darkcharisma]

Darkcharism, that's some awesome work you do!!!

Thanks brother, got your liberty shooting?

[kzz1kaw]

It's pretty easy to feel loose and tight spots when pushing a pellet through with a cleaning rod.  Within some reasonable limits, it's okay to be loose throughout the middle, just not at the muzzle.  Same concept as a choke.

Without a blast of air to make the skirt obturate, you'll see light weeping around any pellet you insert.

🤔 I found that on My gm lw cz bsa zboria barrels I don’t see any or feel any tight spots with a light shining down the barrel and the barrels are very accurate. What I found is the barrel on one of my hatsan would group 6 inches at 30 yards no matter what pellet I tried. Crown leade and tp is good light test the barrel with a pellet  can see daylight. Got another barrel from hatsan cleaned barrel pellet in the bore light test again no daylight. Mounted new barrel clover leaf holes to hole in hole at 30 conclusion bad barrel. Pellet had daylight from tp  to end of the barrel. Same goes with crosman barrels. I do the same with them as I own a few crosman guns. The barrels that don’t show any light are the good one providing the crown leade tp are good. That has been my experience with these barrels. 😎

[nervoustrigger]

Well that's just not matching what I'm seeing.  Maybe we're doing something different but I don't know what it would be.

Here's a Green Mountain .25 barrel with a Baracuda Match


And here's a Lothar Walther .177 with a JSB 10.3gr


Same with a .177 QB barrel but I didn't take a photo.

[kzz1kaw]

I use the largest head diameter in each caliber dunno. Doesn’t matter I guess as long as the end results works for you👍🏾😎

[tracker1955]

I'm really surprised that the barrel shoots well with Barracudas but poorly with JSB 18's. Mine does equally well with the JSB's and Barracudas with 5.53 head size. I haven't tried Barracudas with a smaller head but would be interesting to see what they do in mine.

[USAFANG6799]

Tom - The two PCP's I shoot the most Liberty and Marauder in 22 caliber do better accuracy wise like the 5.50 heads using the Barracudas.
The 5.53 shoot much slower than the 5.50.
But like they say "Your mileage may vary".

[FuzzyGrub]

The 5.53 shoot much slower than the 5.50.
But like they say "Your mileage may vary".

BM 5.52 shot faster than 5.53 in mine by about 20fps.  I didn't have any other head sizes to try.  I haven't tested either for accuracy, until I break that leade step/edge. 

[USAFANG6799]

BM 5.52 shot faster than 5.53 in mine by about 20fps.

That's approximately the difference I found.
I'll have to remember to check my Disco and Chief to see if I get similar results.

[Abefroman]

So, are you supposed to see light in the grooves, or are you supposed to not see any light at all

[nervoustrigger]

Without knowing the precise groove diameter of the barrel and the precise head diameter, there’s no way to know if you should or should not see light.

The skirt will just compress out of the way.

[AVS Stephen]

Bantam Style Walnut Stock. only 3 days of work and much better in-letting than the first stock.

[Rat Sniper (AKA: PaulT58)]

Bantam Style Walnut Stock. only 3 days of work and much better in-letting than the first stock.

Wow!  When you get bored let me know, I’ll buy you a nice walnut board and you can make me one!  LOL!  That is going to be amazing when it’s finished!!!

[AVS Stephen]

Bantam Style Walnut Stock. only 3 days of work and much better in-letting than the first stock.

Wow!  When you get bored let me know, I’ll buy you a nice walnut board and you can make me one!  LOL!  That is going to be amazing when it’s finished!!!

Thanks Paul. If I get good at this I may take you up on that.