It's a WBY Mark V 7MM Mag. I shoot hand loads of 140 gr. Nosler partitions with IMR 4831 powder. Scope is a Leupold Vari-X 3x9. The gun and scope are about 30 yrs old and gun has a slight amount of rust pocking in a few places.

The trend I've noticed is that as I continue to shoot several rounds it drifts though not with any consistency. It basically just jumps around giving large groups. If I let it cool down and then shoot it, it will be close to zero. By the 3rd shot it will start moving considerably (1-3 inches). I can't really afford and don't need a new gun right now and I'd like to make this one work. It meets my hunting needs (or I borrow my dad's .243) but I'd like to have more confidence in it.

Thanks for the feedback by the way. This is new territory for me as you can tell.