I had an old British SXS hammer gun that I believe was originally proofed as a .44, it also had 2-3/4 chambers. I shot .410's through it and it worked just fine. The only thing was the .410 casings would swell slightly and wouldnt fit in a .410 Nitro Special after theyd been fired in the old hammer gun.
Steve


Approach life like you do a yellow light - RUN IT! (Gail T.)