"Sherman Bells articles in DGJ have shown that it MAY be ok."

May is still not definitive.
I'm still having a hard time believing that most of the educated people here talk about gun safety and do this. First of all WHY would you want to do it. There are loads out there made for 2 1/2" chambers, why take a chance on ruining a great old gun and possibly hurting yourself or a bystander.
It's the same as saying I can shoot 3" shells out of my 2 3/4" proofed modern gun. It will fit right into a 2 3/4" chamber why not use it, and it's only figurativly a 1/4" longer.
Those of you that have done it and are still doing it, bless you, though I won't be doing so and I hope that all goes well for you. I hope there will be no pictures posted of blown barrels like the gentleman who shot bizmuth through his old gun.

Small Bore has hit the subject square on the head in his statement.

David