My Browning 7WSM shoots a very good group left and right, (abt 1/2") but not so good up and down. (abt 1 1/2") Any ideas wht this might be?? I'm loading 63 grns. XMR-4350 w/ 130 SMK. Thanks.

i take it your getting stringing, or vertically rising groups. i believe the fix for that is a good bedding job and free floating the barrel. good luck

I don't know what your bench technique is like, but watch your shoulder pressure. That will cause vertical stringing. Good luck, sometimes it's in the load as well. Vary the powder charge and see if round shaped groups result.

A chrono would tell you any serius variations in velocity, which is one possibility.

With no chrono I say try Federal Match primers and bench technique as well. Keep those sling studs well forward of the front rest and behind the pinch bag in the rear.