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David, yes sir, this will work fine on a 300 win mag as long as it's threaded 5/8x24. Hope this helps.

Hi David and welcome to the Buds Community. Yes Sir. .300 Win Mag is 30 cal and this will work to mitigate recoil and muzzle blast. It is a direct fit for a 5/8x24 threaded barrel or appropriate thread to 5/8x24 adapter. Cheers and stay safe!