That certainly changes things. At the muzzle it is going to beat the TBAC .338 can. However at the ejection port/shooter's ear that will be very loud due to the high back pressure. Not a lot of testing for .300win mag cans, let alone on semi-autos. But if they are anything like .308, you'll want a low or ultra-low back pressure can to balance db at the ear and at the muzzle. Cans like the Dead Air Nomad or even an OSS may be more ideal.
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