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How much bigger should the hole through your muzzle brake be compared to the caliber size ?
I know that you can easily and effectively use a brake designed for a larger caliber than what your using, but I’d like to know what the industry norm or lower limit of clearance is .
Cheers
0.6 mm above real projectile diameter at minimum….provided everything is properly lined up.
But even if it is 1mm or 1.2mm above hole diameter, usually a good brake will still be very effective.
As a reminder , a 7.62 (.30 cal ) is 7.82mm in diameter. So a clearance hole of 8.4mm would be the minimum suitable.