In reply to: I can afford $1000.00+ for an action about like I can afford a new double. They might as well be a new DR. I'll build a clamping fixture to test fire it in when I get to that point. If it blows up then it blows up.
I'd think the 45-70 spartan would be much more cost effective than building a home-made double (safer too).
Two barrel blanks on your project gun will cost you almost as much as the spartan, and you know the spartan is safe to shoot.