Mark,
I guess I should have told him, if you want a better choice of vintage guns that actually fit you like a modern gun does you'd best look to Britain and the Continent. Jamie, go on Amazon and look for a copy of The Standard Directory of Proof Marks by Gerhard Wirnesberger (I think my used 1975 addition cost me $10) and also a new or used copy of Side by Sides of the World by Charles Carder. That way you can check out those guns from across the pond before you buy one.
Steve
Actually Steve I was referring to American vintage guns, but I'll defer to you regarding Continental guns. Lots of Lefevers, Ithacas, Smiths, Parkers and others have modern dimensions. Of course, lots of them don't too, but as I said, you just have to look and be selective. As an example, I'm selling a 1 5/8-2 5/8 1905 Lefever right now on gunbroker that fits like a dream.