Daryl,

Yes the law requires a single shot only. Now mind you, I can buy an inline super-dooper whizbang ultra-modern muzzle loader, scope it with modern optics, and load it with a sabot 30 caliber bullet to approximate .308 Win ballistics. That's all legal. But I can't use an ultra-traditional muzzleloading double rifle because two shots are available. Stupid? Yes.

I also appreciate your comments about BP pressures. Did you read Bell's article that I referred to?

Curl