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If your barrel is set up and threaded properly and the brake is built well you will only need a bullet hole abot .030"-.040" over the bullet diameter , I have seen sevaral mass produced brakes that came with a pre reamed bullet hole that was .100" over bullet diameter.
So yes the same brake will work on your 6mm that works on your 7mm , if you setup some fance measuring equiptment that could tell the differance between a bullet hole that .030" over and one that is .100" over , then that would be the only way to tell.
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