I have a 7 twist McGowan varmint contour on my Axis that shoots lights out with the 77gr SMK. It would not shoot the 69 or 62 grain SMK at all. I have not tried anything heavier since the 77s shoot so well. I use 22gr of H335, I have some rounds loaded w/TAC but have not been able to shoot them yet. YMMV.
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