GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: redlined_b16a on November 28, 2017, 09:45:20 AM
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Just ordered a .25 cal bullboss so my at44 .22 short is ready to retire as a powerhouse.I tune and retune to shoot several pellets at 900fps.
14gr-21grain but its favorite ammo is around 18-21gr.
Anyway here is what im trying to achieve.......is it possible?
Looking at the Huma regulator as it seems to be tge best all around.
Looking to shoot 18-19grains between 800-900fps for 20 shots
Two full mags.
Currently set without regulator my tune from 3000 psi down to 2200 psi.
I realize that I should pump only to 2700 psi and probly shoot to 1800-1900.
I will shoot an updated string over the weekend.
With Bob's standard valve mods and .187 transfer port does 20 shots at near 30fpe sound do able.
I'd imagine I can answer some of my own questions but seeing at what psi the gun slings ammo around 850fps And I think thats about 2000 psi.
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While port size sounds @ right if not larger than required ( .170" for a 30 ft lb tune likely more efficient ) ... the Plenum volume is going to be important too.
Personally have an older AT-44 single shot in .22 that is regulated with valve mods and it's sweet spot is at @ 28-30 ft lbs which is 18's @ 860 and 15.9s closer to 900
Set up like this it does @ 30 shots. leaned on for higher power the 20 you seek likely can be found with some tuning and correct mods.
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I would buy the .25 cal regulator
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I have this is my .22 BullBoss, and it works pretty well! (still tuning for optimal - if I can figure out what that is for me!)
https://www.ebay.com/itm/Hatsan-AT-44-pcp-pressure-regulator/162720425677?epid=628699763&hash=item25e2e4a6cd:g:lQMAAOSwmudZ6tsA (https://www.ebay.com/itm/Hatsan-AT-44-pcp-pressure-regulator/162720425677?epid=628699763&hash=item25e2e4a6cd:g:lQMAAOSwmudZ6tsA)
Just my $ .02
Cheers,
TJ