The standard twist for a 243 is 9.25, which is a little fast for those bullets, it still gets the job done just not ideal, what you want is a 12 twist the 22 inch barrel is a little short for me, but you should still be able to attain 4000 FPS, and still shoot some of the heavier stuff, they AI is also a good option you might want to look in to, since you can shoot non AI until you are set up with dies ect, that being said those rounds are a blast to shoot,
Tanks Dean
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