Ive got just a tad over 1000 rounds down my 6.5-284. For the last few hundred Ive noticed it really coppers up in the last half inch or so. What would cause this. I know its due to be set back or changed so thats my plan for this winter. Its 29" 8 1/2 twist and hasnt been set back yet. Any advice on getting it set back. Its used for 1k BR shooting with 139 Lapuas and 142MK's.









