Excellent idea and product. How do the .45/70 tubes shoot?

Rifled 20 or 16 bore tubes would also be a good idea for a 12 or 10 bore for my use, as long as the rifling was slow enough.

I can see a double 16 bore round ball rifled ctg. gun as being a cool gun to hunt with - or for guiding use. Great conversation piece, too.