Thanks guys, Im deffinetly at stage where I need suggestions and support. Regarding the fireing pins, ultimately I'll let the smith decide but I just figured it was a good idea, having read all the other build reports. Honestly I never thought about the 45-70 not needing it done because of lower pressures.

Reference the 45-120 v 45-70 issue, Im leaning towards the 120 just because of the big case. Im not ever likely to make it to Africa except in my dreams but it's long 3 1/4 inch case just looks cool stuck between the fingers of my off hand, and I'll admit thats part of the reason I want a Double Rifle.

While Im confessing, I'll also admit Ive got more than one Bakail for exactly those same reasons Bramble suggested. They arent the girl you want to take to the prom but they sure are fine in the field. Frankly Im not sure Id be willing to cut up a fine SG for the risk of a working DR. As an example, the last Browing BSS I saw was going for over $1000 used and when I think about how much Id want to invest to do the project the "right way", I think Id rather save my pennies for a factory DR will no frills.

My biggest concern with this project is by "sleeving" the barrels they wont be as trim as a true DR. Thats why I chose the 45-70, it was as big as the manufacturer made. If the Idea works Ive been scheeeming about a 58 caliber minie ball in a 28ga brass case. With a little bit of a patch its pretty snug. Then its only a matter of having 58 caliber barrels turned to fit inside a 12ga barrel and chambered for the "new" 577 round???

Now do you see where my mind is going?