Borrow a single shot 12 ga and launch a Brenneke slug from it, aimed fire. This will probably exceed the recoil of the 375. Light muzzleloaders, heavy loads in shotguns are all about the same. Mine is a Howa with a SOOFT recoil pad, about 8.5# and its fine to shoot off the bench for a half dozen rounds. Part of the secret to dealing with recoil(take it from a wuss who knows)is to not over do any session. Another asset is a "standing bench" for sight in and load workup.
