Drawings from the L C Smith "Plans & Specifications" book show a convergance of .3385" from Breech C/L to Muzzle C/L, for a 30" 12ga FW bbl (1.156" vs .8175"). C/L's thus converge at 72.452" from muzzle & are crossed by 15.453" @ 40yds. Included angle is thus 0° 38' 47". Top rib is .566" above C/L at breech & .355" at muzzle for an angle of 0°24' (rib dips below tops of bbls at muzzle). I suspect that in the lower grades in particular the vast majority of these guns were never "Regulated".
Here's the data, anyone built a set Yet.
