I agree with all the above, I think.
Extending the chambers is a very bad idea.
Doing anything to the forcing cones is also not a sound idea.
When we start rethinking the engineers and designers of old guns, we are perhaps arrogant and flirting with what we know not the end result.
To do these things to guns that are older than most men's fathers and grandfathers reading about it is much like trying to use modern gasoline in a 1919 automobile. I think, as an antique car buff and a devotee of wonderful old SxSs, it is a gift that we are given by those great men that designed and built the guns that we treasure today.
Use then well and attempting to remake them is not to be countenanced.
Best,
John
