Ok, I'm really late in this discussion, but here goes. I think the most beautiful single shot rifle made in America is the Hopkins and Allen 922. I own 3 of them and although mine were all .22's, I have hopped mine up to 25-20 and it shoots like a dream. Most of the barrels standard on the gun were extremely thick walled and the 25-20 conversion was pretty simple. I also had some engraving done on the sides of the receiver and it's very pleasing to the eye.
Brent, no pics, but if interested, can I send to you?