Problem Replacing Texan bottle with 3650 psi CF bottle

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You get something, you lose something.

You are getting higher powered shots BUT you get less of them. To shoot the valves that have had the poppet closing spring removed you can't shoot the bottle down as low as before. I fill to 3400 (verified PSI, not the 1" gauge which is 200 PSI off on my gun) and shoot three shots then refill.

Plenty for hunting.

I also can chose to carry a small 4500 bottle to give me one refill in the field.

I've not disassembled one of the new valves but Doug (Dyotat100) found if you pulled the poppet spring out of the valve you got another 50 FPS velocity with the same fill. So only ENOUGH air flow closes the valve during firing. Drop the system pressure too low and the valve stays open during the shot and it dumps. I've had it happen until I learned to keep the pressure above 2000 on my Dyotat100 reworked rifle. I was told that AirForce was leaving the spring out on the new valves to gain that bit of velocity. Yes/No?

No, it's not a perfect system but it's physics. Not a AF spokesman / endorsee but I have some Texans in my Airgun collection because they are a tool that does a job. You have to use a tool within it's limitations. I tell people who complain that AF should have a magazine to figure one out themselves and they would sell a lot of them.... But they DON'T because they can't figure one out either.(because this style of action it would be VERY hard, I sure don't see how. If you make it so different that you COULD use a magazine it would not have the advantages the current bottle/valve/action have)

Same with the valve, want the extra power then there will be limitations on it compaired to the old version. If you can think of a better way, design and build one and prove your's works. It's a 'free' country, if you are smart enough to 'build a better mousetrap', people will buy your idea/product.

I had the AfricanAirOrdance spring in my .457 Texan and it was not fitting well nor working right. Doug changed it out to his spring when he upgraded my rifle and it works perfectly. Maybe he will sell a lot of springs, haha. Great guy and has a lot of experience with the AF platform.

Note also that with an upgraded valve giving more FPE, I lost some flexibility on bullet weights so I'm not surprised to see the new Texan valve being a bit finicky. Physics rules everything.
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Yes the new valve does not have the spring a lesson I learned the hard way is if the gun is way low on pressure the hammer will knock the valve out of its seat into the tank.

Like you said you cannot have your cake and eat it too 😂 

I am the same way in looking at the Texan as a hunting tool not a target shooter. The easiest way I've found to put a Texan on a bench is tethering with a regulator this not only gives me the shots I need for tuning but also lets me find the sweet spot for each grain bullet. I can adjust my reg up or down and shoot at that pressure

@dyotat100

Thanks for the clarification 😊 I didn't think about the 1inch gauge that way but your right it's just like a bubble level you can't use a 6inch level accurately to level 10 20 feet 

Air Force has done some great things with these guns and all in all they are a tank when it comes to durability but they do have there own kwirks and learning curve


 
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Checked my gauge with a Regman regulator (which also makes it much easier to maintain a specific pressure) and it was right on. With the gun tethered at 3200 psi, I’m able to send a 350 gr at 850 FPS and a 290 at 890 FPS. Above that pressure velocity drops. Much better than before, but I think it will do better with Doug’s spring installed. Way better than the 400 FPS I started at though! Thanks for everyone’s advice.
 
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OK Doug's Spring is THE Solution. I spent about 1/2 hour taking a Texan down, replacing the spring and putting it back together. It works at full tank gauge pressure with 200 grain slugs. 300 grain slugs have a noticable and satisfying Kick and at 55 yards completely blew away 1/2 of my Birchwood Casey Shoot-N-C 6" target which was stuck to a 1/2" steel plate :) :) . Still have to try some 500 grain slugs and chrony them. IMHO AirForce should include a stronger spring with the upgrade valve / bottle like they are using in the CF Factory version gun. 
 
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When i spoke to Rachael several days ago regarding valve lock on the older model Texans using an upgraded CF tank. I asked if the newer model texans that came with the CF tank had a stronger spring. She stated that all .45 texans use the same spring they dont use anything different between the older model using the aluminum tx2 and the CF using a tx2 valve . Hmmmmmm
 
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I've got an SS. Had it about six weeks. Got it sighted in and have taken it deer hunting for a shot within 80 to 100 yds. I saw the CF bottle come out not long after I got mine. Thought seriously about getting one, but will now wait while some of the issues are discovered and worked out. Mine is set up now for a 240 gr Nielsen. But, it did seem to shoot the 300 gr Air Venturies quite well. After deer season will play some more.

Hopefully, this isn't getting to off topic. When I was looking to get a big bore airgun, I looked at several of the brands. When I first saw the AirForce guns, I didn't much care for the way they looked. But, the more I looked, the better I liked them as the system seems a lot simpler, with fewer parts than the others. The in-line bottle and valve. Just seemed a lot simpler to me. I also liked the fact the fill was 3000 psi. Much easier to handle. I expect I'll easily be able to take a deer with this. Our deer here are only about 100 - 120 lbs.

Once I cross the deer hurdle, may decide I want more power.




 
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Airgun Depot said Different in a video (Travis and Chris ... Upnorth Airgunner playing Quigly Down Under)







https://www.youtube.com/watch?v=YKTkrzcK0kg







Time Stamp 4:05 to 4:12 for the Hammer spring statement.

Somebody is wrong here (AF or AGD) but the fact remains that Doug's Spring WORKS at all pressures and projectiles!
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Note that he blinks when he shoots (novise) ;-)
 
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Guest said:
What velocity are you getting with the 350 gr slugs? I’ve only tested the 290 and at 3400 psi and the hammer spring maxed out I’m getting 485 FPS. When the pressure drops to 2700 psi the velocity goes back up to 810 FPS, but the whole point of purchasing this bottle was to be able to shoot them at 920-950 FPS so I have a flatter trajectory out to 100 yards. I have no interest in shooting 500 gr slugs at 800 FPS.
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It's definitely valve lock if the pressure goes down and your speed goes up probably need a heavier hammer and spring
 
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