Barrel twist

Speaking from my benchrest cartridge loading background, I'll offer a comment. Every bullet/airgun slug, will have an optimum set of barrel dynamics in which it performs best, one of which is the twist rate. If accuracy is poor, and especially if signs of instability are present, you probably need to try a faster rate of twist. If uncertain, err on the side of being a bit too fast. 
 
The 1-14 twist will shoot 65 to 92 g very well from the 34" Texan bbl. 100+ g the 1-10 would be better.
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