Bore sizes

[Big Friend Ten (BFT)]

Early 10 bores were .790" approximately.

Mark

[10 bore]

I had a 1870's lifter 2 frame with .802 bores with .050 wall so i would say factory dia.??? my 1889 2 frame EH has .783 and my 3 frame 1890 EH has .780 dia bores. i would say you are very close to wright size on yours.

[Pa SxS]

One of you 10ga. guys should gather information and plot it on a graph like Austin did for the 12ga. The oversize bores on the 12ga. ran till approximately the 60k range, then went down to the nominal .729 range. That would be an interesting study.

[J. A. EARLY]

The 10 lifter on a 2 frame I just got is way over .792 (the highest my Skeets gauge will go where the gauge starts hitting the three inches of choke) and has barrels averaging .050 at the very thinnest spots. Where my gauge starts measuring to the end is .030 choke each so if I allow for the overbore I can't measure the overall constriction is pretty tight. 1878