The gun is a 1878 W&C Scott hammer gun with Damascus barrels. The flats on the barrel state a 2.5" length and there is nothing to suggest the gun had the chamber lengthened. The gunsmith stated the barrels minimums are 40 thousandth.
While I am set up to load 2.5" on a Lee Load All, for this gun and a couple other difficult/impossible to replace guns I prefer to use RST or an equivalent. I don't expect to do any high volume shooting with the gun. And yes, I'm probably being far more careful than I need to be.
