DuaneinND:

What puzzles me about the original post by cr500 is this: Wouldn't any lengthening of the chamber also have to change the force cone or taper into the barrel? (And then require a new fitting of a new barrel?) BTW, I honestly can't think of just how the chamber of a shotgun can be lengthened at all. As you said, it's a monolithic piece of steel. Just asking.

In some places in Australia ,steel shot is now mandatory as well. I would sometimes need to use steel shot ,depending on where and what I,m hunting. Mainly I was interested in rechambering an existing 3" magnum side by side to 3 1/2" for use as a pig gun but still being able to use 3" and 2 3/4" shells for birds.

A general rule of thumb is that the monoblock(the solid portion the barrels are fastened to) must be as long or longer than the chamber in order to be safe.


www.duaneguns.com

I will have a look Duanne and see how long the monoblock is. Any idea if the 3" chambered Miroku SXSs were strong enough?