I want the 12 Bore tubes to build a double. So the rules for it will be a bit different.

the 20Bore Forsyth barrel is going to end up being a Jaeger/stalking rifle. I'm cooking up an Aus Buff, etc trip in 2013 with a buddy and in a perfect world I will be able to make a matching set of rifles to take along.

A 12 Bore double for thumping Bovines left over from the Ice Age and a light (relatively speaking) stalking rifle for Boar and a Red Stag.

I have bought the set of 12 Bore blanks in the classifieds for this project. However, being unprofiled blanks, I need to come up with some dimensions to get it turned to.