My buddy and I went shooting a few days ago. His 300win is a ruger mark1 last year it shot great. This year first time out his gun went from .75 group to over a 10 inch group at 100 yards. I had him shoot several groups just to make sure it was not him flinching. It was shot off a lead sled and he was sure it was not flinching. Any idea how it could go from a good shooting gun to horrible. The scope is bushnel 3200. Thanks Jason.