The standard butt plate and stock being narrow and the rounded edges feeling like they aim the recoil into your shoulder. A old style CF combat jacket with the liner fixes it. So does a Pachmayr slip on recoil pad.
Anyway, what you're talking about is your Length Of Pull(LOP). It's the same with a Lee-Enfield as it is for a Win M70. Tell your buddy to grasp and shoulder a yard stick like he would a rifle. Where his trigger finger is on the stick is his LOP. Same thing with the stick in his bent elbow.
Stick lengths are given here in Post #6. http://www.milsurps.com/showthread.php?t=3862
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