1-8 twist in your .243 Win...? I was shooting a 30" 243 WSSM just under 2950 fps'…., I couldn't the DTAC 115gr. bullets too track straight at 1k... 600 yards it was still not where it needed too be. I was shooting the 1-8 twist... spoke to Tubbs... he thought 1-8 "might??", "should" "could" or "would"????'…, at that time; stabilize it with that kinda kick I had. It turned out I had to go to a 1.6.5 to get them where they needed to be. Not saying the accuracy was poor from a 1-8 twist, but I defiantly picked up quite a few more 10's and X's when I made the change. I just can't help think a faster twist in a shorter barrel might help some what.
Maybe not; perhaps mine is an isolated case... but I would've thought a 30" barrel at 2950 fps plus in a 1-8 twist would have turned that 115gr fast enough.
Good luck.
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