Drew;
As promised, data on 16ga Lefever choke.
Gun = H grade SN 62,596 with 1907 patent date so one of the later ones though no indication of an Ithaca build. 28" barrels of "Best London Twist". Bores both measure 669" to within 4" of the muzzle. Choke taper begins here & ends @ 634" R (035" choke) & 632" L (037" choke).
Both chambers will take a .732" chamber gage to 2 3/4" (Current SAAMI Minimum chamber dimension for 16ga) I had thought I had previously determined the chambers actually measured to 3" which could be accounted for if they were just more than 001" undersize at forward end, though this may have been in error. They are at least a full 2 3/4" & not the usually expected 2 9/16" for 16ga.
