I dont know what kind of 12 gauge ammo and guns you are using, but there is a huge difference to me anyway.

A suppressed 50 is not fun to shoot as far as recoil goes. And when you start pushing 750-800 gn bullets fast, they suck even with a good brake.

I had a McMillan bolt gun for a long time. Didnt kick that bad, but it weighed 34 lbs and had K&P brake.

Now days I have a Barrett 82 and a Accuracy International AX-50. The 82 is fun, but too loud and not that accurate. The AI is very accurate, but its light weight equals more recoil.