Thread: Has anyone had this problem?

Originally Posted by 7mm Rem Mag

Not thoroughly so I am in the process of doing that right now, thank you for that idea though as it gives me a glimmer of hope that it could be the problem but not sure why it would increase in velocity by 110 fps

Copper can/will increase pressure. But I would say coupled with different conditions on different days including light. How fast you fired your strings how warm or cold your barrel was reliability of said chronographs etc will account for the velocity and possibly accuracy issues.

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