Helium testing results for the extreme big bore .40
I did some testing a few weeks ago with helium but I did not want to post the results until this gun was let set for 14 days with a charge in it and checked the pressure for leaks and it still had a full charge in it after 14 days so in my book it passed the leak test. I took the gun just as it was set up for nitrogen and put helium in it First shot 4200lb fill 230 grain slug 1480 FPS giving 1118.6 FPE but the problem was the entire charge tube was almost gone after 1 shot. So I detuned the valve and fired it again same 230 bullet 4200 fill it shot an even 1200 giving it 735.5 FPE the second shot was at 980 FPS not the best results for shot count but damn this is what I will hunt with the first shot will be devestating and the second shot at 980 will be more than sufficiant for a kill shot if needed. I am convinced that with a 5000 to 5500 lb fill the shot count will give 2 full power shots(high 1200’s) and a third shot around the mid 900’s but I need to get my helium tank refilled to prove this out.
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RC We use a 6000psi helium tank rented fron welding supply company…looks like the same style tank as the 6000psi nitrogen tank. No booster tank needed…Helium tank weighs about 200 lbs, wish the helium made it a little lighter though 🙂
I have been wondering what it would do with my 420 grain bullets. I get over 600 FPE now at 812FPS.
However how my valve would handle Helium I do not know. Right now I get two shots at that level, so it may empty my tank like the 1128 FPE shot did Big Bores.
Whether all this would be practical in the mountains while hunting is the question.
I assume Big Bore is also using a booster pump to boost the pressure from his helium tank.
One question I have is will the helium make my rifle and fill tank float? 😆
Regards,
Roachcreek
RC,
makes ur ranger look like a POS… 😆 just kiddin, you tried helium in that monster yet? 😯
Big Bore Info…..
X2
Regards,
Roachcreek
same 230 grain slug with nitrogen 4500 lb fill 980 FPS 490 FPE. I do not use compressed air but A266 and his testing on the same gun on compressed air had the same results on the chroney. As for the elaphant gun on a big bore rifle there is no such thing as too fast as long as it is accurate. Our goal was to make a big bore that is not only lethal at 100 yards but devestating at 100 and have the velosity fast enough so when the gun is zero at 50 it will only be 1 to 2 inches low at 100. In the field hunting things happen fast and there is not always time to use the range finder worrying about is it 70, 80 or 100 yards with balistics that the helium offers that will never even be a thought in my mind. Plus with the increased speed the bullets perform much better making a much bigger wound chanel. Better blood trail and a quicker easier recovery.
How much FPE does it do with normal air and the same pellet?
😯 😯 😯 😯 😯 😯 elephant airgun? 😀
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Roach creek there are many things I must resolve with this helium issue the first is to find a tank like the A/F tank that can be charged to 5000 lbs so that a recharge can be done in the field. What kind of rifle are you shooting it sounds like whatever you have is pretty bad ass the reason I ask is you will definately have to limit how far the valve opens helium is three times less dense than air just say your valve opens .125 inches for .0005 seconds on air now there will be three times more helium go through your valve in the same amount of time creating alot more chamber pressure. Without a way to limit the valve opening I think it will drain the tank in one shot. Also if you consider using helium fill your gun and let it set over nite and check the pressure the next morning being less dense it will find any issues that are not rite. Believe me the first time I filled our rifle and let it set with helium over nite it leaked. Make no mistake helium is the next level for the person who wants the untimate performance out of there air rifle.