Dave, the Remmy has been dreamed about for several years. None have ever been seen out side of a few examples at gunshows. Don't hold your breath! I'd look at Colorado's DR's if I were looking for a setup you describe. He did or maybe does advertize them at 'gunsamerica.com' 45-70 to 50-140 smokeless loads.
-------------------- "When you see that in order to produce, you need to obtain permission from men who produce nothing; when you see that money is flowing to those who deal not in goods, but in favors; you may know that your society is doomed." Ayn Rand