So yesterday I finally made it to the range with my new Cooper 52 Excalibur in 300wm. While shooting I discovered two significant problems and am curious if there is a easy fix to either. First, when I shoot the rifle the rear of the magazine comes unseated and drops low enough to the point that the bolt does not pick up the next round. Second, after firing a shot the spent brass is hitting the windage knob (almost every time), and then landing back in the chamber. I am using a luepold vx3 and talley one piece low rings, as recommended by cooper. I'm just a little agitated because I love this rifle, it shoots amazing, but these two issues have essentially turned the gun into a single shot rifle. I think I may know the fix for the magazine issue, but don't want to do something that is incorrect and end up with more problems. Also, FWIW the rifle only has approximately 15 rds through it. Any help is greatly appreciated.