What was the black powder proof load for a 20 gauge? Did it change from the same 20 gauge as a muzzle loader? Was it in grains of black powder or drams? Thanks for any knowledgeable answer.

I was at a large muzzle loader shoot this weekend and one builder explained what load he proofed his guns at. It was scary. Much greater than a double load of powder. Got me wondering what proof load my 20 bore suffered when new.