Absolutely zero reason to go above 3000psi on 257. You get few shots out from it and everything you can stabilize out from 1:14 goes well above 1000fps.. so unless you get new barrel at 1:10 or faster its just 100% waste of money. Also Iv never heard anyone got 1:10 to work so if you do dont choose that tr.I'd say just see how your barrel is. If your barrels good then go from there. Just do the basics stock barrel good cleaning components. Also casting your own slugs is also pretty cheap to get into. I'm pretty sure you can go to 3625 psi bottle and get more performance out of 257... I do not personally know exactly what you have to do to get to work at 3625 psi with new bottle. There are a lot of members here with .257 that have experience with them. Ill help you with what I can. Good day good luck with your Texan friend
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