I have been reloading for a 7 rem mag for several years. Bought it used. Had it glass bedded & trigger adjusted. Redding Type s full length bushing dies. Tried 8 different bullet/ powder combo. Just shoots MOA w/ Leupy 3-10 CDS. It has a slight burr on case shoulder in chamber. Sent to smith but still there. Just not as bad. My problem is reloading. Last year experienced case head separation after 2 reloadings that feed stiff. Ordered new brass. Shot ok with virgin loading. However, I am having difficulty sizing for smooth feeding. I can set the shoulder back with no improvement. I sent 5 fired cases to redding that they sized and results were the same (3 cases). I covered sized brass from redding and my sized brass with a black marker to show contact points with nothing conclusive. Any ideas on what to try next as far as reloading? If I would sell & buy a new rifle what would you recommend for Mule deer in Colorado? I am thinking about a 6.5 or another .284 with NO BELT! Then which rifle for around a grand? Thanks in advance LRH members!