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The muzzle pressure is higher in the magnums than the .308 but not really enough to cause muzzle expansion (unless there is some foreign body in the muzzle such as dust, dirt, water, etc). Muzzle...

Robbie Tiffen at Gunworks offers his suppressors in 9/16" UNF (18 TPI) which is about 14mm leaving plenty of meat at the muzzle. His suppressors also have a rebated thread meaning that a runout...