I seem to be noticing a lot of my groups of late,that I seem to be getting vertical stringing sometimes of up to 2" at 100yds off a benchrest with a caldwell tripod (which i place approx under fore end swivel area ater removing swivel stud)and a caldwell bag placed under cheek piece of stock(swivel stud also removed). This is with a proven load (.75-1"moa)and Im inclined to think that its me more than the rifle.Im getting this pattern in both my rifles (243,7mm08 std hunting rifles). Had a very lightweight 270wsm that I started flinching with about 3years ago. Got rid of this rifle as i found it unpleasant to shoot. I did look at my shooting technique rather critically with this rifle and eventually came to terms with it and got it grouping very well.Initally with this rifle when i started flinching my groups had a horizontal pattern to them... Just looking for any advice as to what to look for with my bench technique???...triggers already lightend off.