Lighter will definitely give more "kick". The increased payload plus the increase in velocity could combine with that to cause it. Not saying definitively that is the problem, but it's the first place I'd go. Sometimes it is not the inertia of the slide that actually causes it, but an inadvertent movement of the thumb under recoil, that moves it rearward as the gun "returns to battery", after the actual rearward recoil. This seems to happen more with straight gripped guns than pistol gripped ones, in my experience. IMO, the hand is more likely to slip forward under recoil, with a straight grip, thus setting you up for the thumb to catch the slide and pull it rearwards as the gun returns to battery.
You might try adjusting your grip for a few shots to be absolutely certain that is not happening, before pulling the buttstock.
SRH
Last edited by Stan; 05/04/18 06:58 AM.
