The Lefever forum had a discussion about frame sizes, especially the different 10 gauge frame sizes. I have Lefever tens from over ten pounds down to my steel barrel 7 1/4 pound gun, in half pound increments. I would love to see the order sheets for all of those guns. When the Lefever site updated their forum, we brought the old discussion of frame sizes to the new forum. As far as I know, it is still available for research.