If I have a shotgun barrel say starts off back up in the barrel at >724< then 4 inches from the muzzle opens up to >780< Then comes back down to >673< at the muzzle, What would this be called ? MOD FULL XFULL or what.

And also how would this effect the performances on the final constriction of say a full choke, or would it have any at all Compared to one that goes from say >730< down to >693<

Also what would the chokes be on these two guns?
First a 16ga. goes from >668< down to >649< at the muzzle.

The second one is a 12ga. and goes >730< down to >693< at the muzzle.

if any of these numbers sound out of whack let me know I might have read something wrong on the micrometer.

Also can someone tell me what is the normal constriction of MOD / FULL / X FULL chokes?