; Stock length for a ML cannot be compared to a stock length for a Skeet Gun, Trap gun, Sporting Clays gun, upland partridge gun, quail gun, whatever gun - just doesn't compute, due to differing styles of shootng requiring different stock lengths. As well, a person's height doesn't come into it much either, but length of neck, length of arms, straighness of back- normal posture, shooting style, straight-back and head or climbing into the gun crawling the stock, hard to cheek along with stock styling - all dictate a 'proper' stock length .
: Most shooters with lots of experience can shoot a range of lengths just fine and don't have to have a 13.679" LOP. One that's between 13 3/8" to 13 7/8" will do just fine.
; I'm 6'1", 200lbs with a 36" sleeve, and prefer something from 13 1/4" to 13 3/4" I can shoot a 14", or a 13"- doesn't matter much, just move the shoulder to compensate. After a few shots, it's a natural position and the shoulder moves automatically when mounting the gun. It isn't like getting set, "Into" the gun before the shot to call "PULL". Most ML shooting is offhand shooting. Most ML shooting is straight-up, straight back with the head held high.
: Shooting requirements have different stock length requirments. You need somehting that will work over a variety of positions. We arent' held to one type or holding style as in trap or skeet. We have 1 sitting shot and 1 squatting shot on the trail-walk. The remaining 48 shots are all offhand at ranges from 12 yards to 100yards. Some are up hill, some down hill. Some crouched, some stretching to ge tover a branch, or crouched under one. One, non-offhand shot is close, 18 yards or so, at a squirrel's head through a crotch of a tree - taken while 'squatting' & the other non-offhand shot is around 75 to 80 yards at a 4" round gong target. Both of these are kinda 'gimmies'- easy targets, except both are left handed for right handed shooters, right handed for lefties. No sense making them too easy. There are a several more left-handed shots - so what's the correct length of pull? Whatever feels best for most of the shooting you do, is the correct stock length for you. For most people, it's between 13 1/4" and 13 3/4". People from 5' 10" to 6' 2" who have over 14" pulls, usually end up getting them shortened & that can be expensive due to re-inletting and finishing. 13 1/2" to 13 5/8" covers most people just fine - so, pehaps that's the formula?