I couldn't agree more, Fred. An affordable, American made double rifle would be a godsend. In the meantime, I've made do with what pretty much everyone else has made do with - bolt action .375's and .458's. Not a lot of romance, but they sure do work.
My current battery includes a Model 70, an Interarms Mark 10 Mauser, and a Ruger #1 all in .375 H&H. My current .458 is also a Ruger #1. The single shots add back in some element of the romance of a double, but some would question the wisdom of using one on big critters that fight back. I've found, however, that I can reload one very quickly by wearing an Uncle Mike's stretchy nylon cartridge holder as a wristband on my left wrist, which places cartridges very close to where my right hand winds up when I push the finger lever forward to open the action.
I've scratched my double rifle itch, and satisfied my penchant for the unusual, with one of the Pedersoli Kodiak double barreled muzzle loaders in 12 bore. I haven't hunted with it yet, but I think it would make a dandy feral pig shooter. I hope to find out this year.