30 cal brake on a 6.5 CM. GTG?

Good to go. They become less effective as they get more oversized. How much, I couldn’t tell you. For sure not dangerous to go bigger.

Precision Rifle Blog did a comparison of a wide variety of brakes; using one slightly oversized resulted in single digit percentage reduction in effectiveness.
 
Well thanks.
I’ve done a bit of research also,Via the internet.
Appears to be GTG, the differences are so small , that it’s a non issue for me.
 
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