Lacking a true LOP, DAC. DAH gauge, I used the method described on Midway by Larry Potterfield,so the below measurements should be within 1/16" There is no visible cast for either the Greener or the Mears
Greener:
w/o pad DAC 1 3/8”, DAH 2” LOP 13 7/8”; w/pad DAC 1/ 3/8” DAH 1 9/16” LOP 14
Mears Brothers:
LOP 14” DAC 7/8” DAH 1 9/16
Measurements of a gun that does fit me well:
LEOPOLD BIEDER OF VIENNA (FN 1930) STOCK: DAH: 2 5/16". DAC: 1 3/8" LOP 14 1/8"
How far can the average person go outside of their 'ideal fit' and still shot a gun reasonably well? A 1/8" inch or even a 1/4" inch
That's a bunch of difference...
I don't think there is an "average person"; some people are adaptable, some aren't.
An instinctive shooter will be more effected by a gun that doesn't fit them than a more deliberate shooter who finds the right "sight picture" for a each gun. I'm the former, and a poorly fitting gun is useless to me.