OWD; Take a look at
www.jimeyster.com and read all about it. He discusses forcing cones, choke angle and boring of barrels in a lot of detail. Much of this work was done when almost all 12 bores were .727". Now, manufacturers are producing their products at .740 because supposedly they pattern better and less perceived recoil. Kolar even made .750" barrels for awhile. The guys I know that have them really like them because perceived recoil is apparently very low. I've heard Kolar quit making the .750 because in order to keep weight down, the barrels were thin and dented easily. I haven't heard that from Rags at Kolar, but just shooters in the know. Frankly, if guns fit, I can't tell much difference in perceived recoil in .727 vs .737 or .740. I shot a .750 once and it still seemed to kick.
