Here is my question? I have a Texan CF TX2 .510 cal I know the .45 and 50 share the same valve. Could I possibly rebarrell to a smaller caliber say 40 cal for example. I know the 257 Texan and 30 cal.have the same valve. I have a lathe and can do the barrel work myself. I would love to.get the African Air Ordinance 4500 psi upgrade for the 50 but I just can't do it with my finances now. I reliaze that I need a booster pump to fill over 5500 psi that will fill my Scott 5500 psi scba tank and than hook.to my aqua environment regulator that goes from 7000psi . I have half the tools to.get there put no cigar. I would like to buy a match lapped barrel my Lother Walter shoots ok but it is a little rough in a few areas. What is the limit on smallest caliber I could put on my factory Tx2 valve? I used to work at E.R Shaw barrel manufacturer in bridgeville pa I have a .375 caliber barrel that I acquired from working there. Any input appreciated? I know there is always a practical limit.
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Tuning Airforce Tx2 Valve Caliber Change maybe?
- Thread starter RM.510bigbore
- Start date
I think the big problem is that when bullets gets lighter the valve does not stay open as long (Dwell time).
So a heavier hammer might do better in giving you full use of the air.
I see no problem in a .308 barrel with a fast twist for long and heavy bullets.
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If I stick with 250 to 450 grains cast weights in Caliber say 40cal should work. I might try my 26 inch er Shaw .375 cal barrel out for A Texan barrel swap. Barrel is new and has been collecting dust for years. If it doesn't work I'm not out any $$$. Now to find a decent.375 cast. Mold. As always thank you for your much valued opinion.
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Why not switch down to a .457? Easy switch, good performance, and lots of mold for bullets!
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Capt Keith you are probably right. I'm pro going to try 2 barrels one cheap shorter green mountain 26 inch and a aftermarket 33 34 inch . The reviews for the green mountain barrels are pretty good. Might be worth spending $120 and giving one a try. At least when you r not wasting money on powder and shells we air gunner s have extra money for more barrels. 
In my younger days I ruined so many premium barrels with custom hot rod barrel burners. Well now I can can buy one premium bench rest barrel and at even 4500 psi with air , should never wear out with soft cast lead powder coated slugs. My .375 barrel is too thin can't use anyway
Switching from 45 to 50 cal should be real easy everything is the same. Just wanting more versatile Texan and maybe even a short 26inch barrel that is kinda handy lol
In my younger days I ruined so many premium barrels with custom hot rod barrel burners. Well now I can can buy one premium bench rest barrel and at even 4500 psi with air , should never wear out with soft cast lead powder coated slugs. My .375 barrel is too thin can't use anyway Switching from 45 to 50 cal should be real easy everything is the same. Just wanting more versatile Texan and maybe even a short 26inch barrel that is kinda handy lol Upvote 0