I used one on a 223 I built for my wife, nice barrel. It is lighter than the varmint contour. She still says its heavy, but she shoots off the bench so it *shouldn't* matter.
I can't remember if I went with a 9 or a 12 twist but it shoots great. I threw a light load together, sighted it in with 3 rounds then put a 5 shot group inside a dime-all touching.
I can get some pics later today if you need them.
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