New project: .177 slug gun

[oldpro]

 Youll gain 7 fpe Min. with the slugs. Thats one mean 177

[Motorhead]

Dillon,
I too am watching this thread wanting to see how the JSA valve does ( Unregulated ) and running in the valves sweet spot of 3k - 2.2k pressure on Full size porting against .178" of bore diameter area & @ 16 grains of weight.

watch watch watching

[Wayne52]

Dillon I'll bet the JSB Beasts or even the Monsters would do got in that gun too.

[Motorhead]

There is ALSO the H&N Sniper MAGNUM pellet which is a 15 grain "Semi-Pellet"

[Wayne52]

I have those as well Scott and they shoot very good!

[Dairyboy]

Oh good idea Wayne I completely forgot about the beasts and monsters in .177!

I should try those sniper magnums as well. However only if the slugs don't work then I'll try the heavy pellets.

[Dairyboy]

Youll gain 7 fpe Min. with the slugs. Thats one mean 177

That's what I'm thinking as well should be a good gain in fpe! And it sure is thanks to the SS valve!

Dillon,
I too am watching this thread wanting to see how the JSA valve does ( Unregulated ) and running in the valves sweet spot of 3k - 2.2k pressure on Full size porting against .178" of bore diameter area & @ 16 grains of weight.

watch watch watching

I'm excited to see how it does too Scott! Honestly I can't remember what the ports are on the TP and barrel...guns been sitting ready to test for months. I honestly think it's just at .140 but I'll double check.

[Dairyboy]

So initial results are promising. Here's the shot groups at 22yds 5 each. Top middle is the 15.5 which were shot first. Bottom left were the 18gr shot second and bottom right 21gr shot last. The "flyer" in both the 18gr and 21gr were the first shots and the following 4 on both went into the same hole so maybe just getting used to the changed slug.



52yds this is the 15.5gr the worst of the 3. But maybe shooting these alittle too hot still need to chrony them.



These are the 18gr which did pretty well.



These are the 21gr which I think did best.



Over all I think they did pretty well and I will try to better them. Just wanted to do some rough shooting with them and get an idea. I only got the sampler pack which had 33 of each and 1 extra 21gr. So I'm already low on them. Will likely be buying the 21gr for sure and probably the 18gr as well.

[oldpro]

 Need FPS reading to know whats being over or under shot it might clear up some needed tuning to get tighter groups.

[Motorhead]

I too had my SS valve in hand today, made up a transfer port reducer bushing and T port to put valve back into an unregulated .177 M-rod with full bore spec porting.

** What type hammer & weight you testing with ?  SSG or TSS too ?
** What size air bleed jet ?

Thanks !

[Dairyboy]

Will get some numbers this evening Travis!

Scott, excited to see what you come up with! I forget the actual weight but I think in the 26gram range MDS. Stock hammer spring with SSG end cap and 88 jet. Not sure on exact HS setting cause the end cap is threaded so the hammer tensioner can come out all the way.

[Motorhead]

Will get some numbers this evening Travis!

Scott, excited to see what you come up with! I forget the actual weight but I think in the 26gram range MDS. Stock hammer spring with SSG end cap and 88 jet. Not sure on exact HS setting cause the end cap is threaded so the hammer tensioner can come out all the way.

That was the primary Q ... 26 mds and ssg.

need to ask travis what the hole size is on a #88 jet

[Dairyboy]

No SSG just standard spring only just the end cap left over from SSG so I can back it out as far as I want. .1025" from what I found on Google is what #88 jet size

So got some numbers...I'm surprised at how close they were to my estimates!

15.5gr at 1000fps

18gr at 933fps

21gr at 850fps

So I'm guessing that the 15.5gr are traveling too fast.

[oldpro]

No SSG just standard spring only just the end cap left over from SSG so I can back it out as far as I want. .1025" from what I found on Google is what #88 jet size

So got some numbers...I'm surprised at how close they were to my estimates!

15.5gr at 1000fps

18gr at 933fps

21gr at 850fps

So I'm guessing that the 15.5gr are traveling too fast.

They might tighten up at 900 fps

[Dairyboy]

They might tighten up at 900 fps

Yeah that's what I'm thinking

[Motorhead]

.102" that is huge ...
Did we miss a decimal point by chance ?

Lol, did a few searches and found that a Mikuni # 89 is at .035" making much more sense and sounding about right speaking with Travis on said subject in the past.

Ok, so i should be able to play as well with a .177 Monster gun here in a few weeks.  My plates full the next few weeks no no further playing happening 

[Dairyboy]

.102" that is huge ... like having no jet at all & no corba air spring effect

Did we miss a decimal point by chance ?

Well I just looked it up online so could be off. Now that you say that that's way too big. I do know it's an 88 but must not be the size I looked up

[Motorhead]

.102" that is huge ... like having no jet at all & no corba air spring effect

Did we miss a decimal point by chance ?

Well I just looked it up online so could be off. Now that you say that that's way too big. I do know it's an 88 but must not be the size I looked up

Try this ? .... http://www.historicmotorcycle.org.au/Adler/carby/jets.txt

[Dairyboy]

Thanks Scott! So .88mm is what it is so like .035" lol that sounds right

[KnifeMaker]

Dillon, Tofazfou, (Cedric), ordered and had fitted a .172 TJ's bbl and it is a laser. Reaching way out there and getting head shots on G. Squirrels at 130+ yards.


Very impressive!  Here's the linky.   


Knife