I have Lefever 12 gauge guns of weights from 6lb, 7lbs, 7lbs to 8lbs. The width & length of the bar is essentially the same on all of them. Each one has a different width & height of the standing breech plus a different spacing of the firing pin centers. Thus the barrel weights are also different.
A 16ga with the XX marked frame is narrower in the bar than any of these 12's including the lightest one even though the 16 weighs 6 3/4 lbs.
A 10 lb 10 ga has a wider bar as well as a massive standing breech with very heavy barrels.
So How many frame sizes are we speaking of here. Does just varying the standing breech constitute a different frame size or does it also require sizing the entire actio body.
A little 28 ga American Arms Co (Crescent) hammer gun has a very petite little frame with a weight of about 5 lbs. Personally I would call this a "True" 28 ga frame. Had the bar & body remained the same as a larger gauge with only the standing breech sized down for the smaller barrels I would not personally call it a "True" frame size for the gauge. To me to be considered a "True" frame size for the gauge it takes sizing of the entire frame, not just a fitting of the standing breech.
