They might fit the chamber ok which will(should) shave lead on a .375 ball. If it loses the patch in the forcing cone like I think it will you'll just have a .350 ball banging around on it's way out the muzzle. No bore pressure to get muzzle velocity up and no accuracy. Try it if you like. Won't hurt anything. The patch will blow out the muzzle but I wouldn't shoot it over dry grass.
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