I make it a practice to shoot what the gun was originally intended to shoot. It's too easy for the odd stoutly loaded 2 3/4" shell to get mixed in with your others. For the odd occasions that my damacus and twist guns get used, the price of a flat or two of RST is cheap insurance. I started using Maxi-Lites in 2 1/2" and like them so much I also use them in 2 3/4".
One of my twist barreled guns had a minor bulge at the forcing cone, and while it was easily repaired, I can only assume it was the result of using a longer-than-intended shell, and probably paper.
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