4" .357 revolver
probably my 686 with .357s in it. Next would probably be my AR.
Funny, i am able to shoot my mosin without hearing protection with no problem. Alot of people here say it is their loudest gun.
I've got a Contender in 35 rem 12 inch hunter bbl, So loud I refuse to shoot it without hear even while hunting, for this reason I don't use it much