Rev. With a hasty sling not enough to tell in the field. I have also shot quite a bit of high power w/ M1917, Spfg. M-14 and M1's w/full up TIGHT shooting slings w/no poi change from OH sight settings. I am sure that the band mounted swivels on the M1,Spfg and 1917 do put some downward pressure on the barrels. Been 2 bulls arrowed just off of my property in the last week.-Muddy