I have not seen any (yet) but most of the claims are in percentage ... too many variables. Jerry from JE Customs (https://www.youtube.com/watch?v=yBfPrlE5SX0) and Dean Maisey of DF Maisey Muzzle Brakes from New Zealand (https://www.youtube.com/watch?v=fsOQWA3-NLY NOTE: multiple parts video) did one of the best IMHHO muzzle brakes video test comparison.
Cheers!
Ed
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