Extreme Big Bore 5000 PSI testing
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Extreme Big Bore 5000 PSI testing
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Topic: Extreme Big Bore 5000 PSI testing (Read 3227 times))
Extreme Big Bore
Plinker
Posts: 263
yes
Real Name: Brent Hoag
Extreme Big Bore 5000 PSI testing
«
on:
May 17, 2017, 06:51:27 PM »
Hello I was doing some fun testing today and had a customers 72 caliber and decided to try something new tested 21 inch barrel 600 grain slug at 4500 psi 696 fps at 643 FPE. I decided to change a few (very small things) and shoot 5000 PSI the same rifle at 5000 psi shot 600 grain slug at 735 FPS at 719 FPE that is around a %6 increase. At 5500 psi I actually got kind of a bell curve first shot 725 FPS second shot 700 with the holes within the bulls eye at 50 yards for 2 shots with a 19 inch charge tube. Getting up to 6000 psi with my booster is no problem it is a 50 to one booster take 125 PSI for the low pressure side and multiply it by 50 it can go to 6250 easily use 150 Psi on the low side and 7500 psi. Much higher than we can use now I had a high pressure seal built to take these pressures so it will last. I did the same testing with helium and WOW I will not post the results of that with the higher pressure but amazing. I know everybody does not like helium but if you want close to powder burner results you have to try this out. On helium in testing today we actually got more velocity with our 45 caliber air rifle 255 grain Mr Hollow point than a 44 magnum pistol with a 12 inch barrel shooting a 240 grain slug. Believe it or not I did the test today.
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Mayville Michigan
Erockrocket
Plinker
Posts: 143
yes
Real Name: Eric
Re: Extreme Big Bore 5000 PSI testing
«
Reply #1 on:
May 19, 2017, 10:55:32 PM »
More power than a .44 Mag? Thats quite an accomplishment using helium.
Id like to see that video!
Like reading about your different experiments, and helium use.
Looking forward to the upcoming Midwest Airgun show, maybe we can chew the fat.
Eric
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Ohio, Coulmbus
Too many airguns to list, from .177 to .58
Back_Roads
I Got A 15 Pump BB Gun :) BB Guns Got Much More Complicated :)
GTA Senior Contributor
Posts: 15876
1st Edition Crosman 760 Pump Master
Real Name: James Seiler
Re: Extreme Big Bore 5000 PSI testing
«
Reply #2 on:
May 19, 2017, 11:17:20 PM »
Sounds like it likes helium best
, seems like a lot of pumping for them hand pumpers though
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Extreme Big Bore
Plinker
Posts: 263
yes
Real Name: Brent Hoag
Re: Extreme Big Bore 5000 PSI testing
«
Reply #3 on:
May 19, 2017, 11:36:04 PM »
I am sure with enough engineering and determination a hand pump could make helium work Back roads. Erock helium is the most amassing thing I have used. Some say other have used it I have seen no results of there work but we have perfected it have thousands of rounds using helium and great results with zero failures or leaks.
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Mayville Michigan
Rob M
GTA Senior Contributor
Posts: 6308
Re: Extreme Big Bore 5000 PSI testing
«
Reply #4 on:
May 20, 2017, 12:05:30 AM »
let me get this right , you compressed helium to 5000 psi?? that must have been insane numbers !
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Louisiana
Extreme Big Bore
Plinker
Posts: 263
yes
Real Name: Brent Hoag
Re: Extreme Big Bore 5000 PSI testing
«
Reply #5 on:
May 20, 2017, 01:08:15 AM »
Yep go to hog helium and air rifles you tube
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Mayville Michigan
MJP
Member 4400+Fpe Club
GTA Senior Contributor
Posts: 2136
I'll make it real. For me.
Real Name: Marko
Re: Extreme Big Bore 5000 PSI testing
«
Reply #6 on:
May 20, 2017, 05:51:15 AM »
.72 and only 643FPE on 4500psi? Dont you think it should do more? Try a lighter slug on that one.
Marko
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Finland
Impossible just takes a little bit longer to achieve.
If an engineer is not presented with a suitable problem, they will create their own!
Extreme Big Bore
Plinker
Posts: 263
yes
Real Name: Brent Hoag
Re: Extreme Big Bore 5000 PSI testing
«
Reply #7 on:
May 20, 2017, 09:26:10 AM »
Yes but remember 21 inch barrel. For some reason on the 72 cal the bigger bore short barrels seem to slow down much more than the smaller bores. The .457 21 inch looses about 50 FPS but the 72 looses over 150 FPS. In the 72 the .437 shoots about 930 with a 28 inch barrel with the 21 it is around 770.
«
Last Edit: May 20, 2017, 09:30:54 AM by Extreme Big Bore
»
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Mayville Michigan
Extreme Big Bore
Plinker
Posts: 263
yes
Real Name: Brent Hoag
Re: Extreme Big Bore 5000 PSI testing
«
Reply #8 on:
May 22, 2017, 03:00:52 PM »
I put a different spring in the 21 inch 72 cal for the sabot test and it shot the .437 grain 828 FPS 665 FPE 600 grain 746 FPS 741FPE the shorter barrel needed just a little bit more spring. These were lead bullets. Done testing this 72 cal shorty it is headed to its new home. I think he will be happy with this one I know I had fun with it and like this short version. I think I might have Mr Hollow point make me some 475 grain solid nose and put a shorty together for myself get that bullet about 1100 FPS and put a 3/4 inch hole through something I cant see to many things on this planet that could take that.
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Mayville Michigan
MJP
Member 4400+Fpe Club
GTA Senior Contributor
Posts: 2136
I'll make it real. For me.
Real Name: Marko
Re: Extreme Big Bore 5000 PSI testing
«
Reply #9 on:
May 22, 2017, 11:50:18 PM »
Told you it seems low, you just needed a little push.
Marko
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Finland
Impossible just takes a little bit longer to achieve.
If an engineer is not presented with a suitable problem, they will create their own!
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All Springer/NP/PCP Air Gun Discussion General
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Extreme Big Bore 5000 PSI testing