We've only been discussing "vintage guns" in the sense of guns 50-100 years old. The problem of bulging muzzles cam be eliminated by open chokes. Then the problem of pressure and recoil are left.

I recently bought two guns made in the late 1960's - early 1970's, a Janssen Fils 3" 12ga. and an AYA 3-1/2" 10 ga. I'm thinking choke tubes would solve any bulging problems, the rest of the gun should be able to handle the pressure and recoil if not excessive.

Both these guns were built for "modern" loads, do current steel loads exceed those limits?

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