Barrels will be marked with the frame size on the bottom of the bolting lug. With the exception of very early hammer guns and barrels that may have had their stamping filed off for some reason.
Determining frame size of the frame itself would require measuring certain areas of the frame. Firstly the firing pin spacing. And for some frame sizes, the height of the standing breech is also an important area to look at.
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B. Dudley
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