Originally Posted by jimbothepunk
so what would you call it when the rifle lifts a bit?
Improper rifle design. Drop at comb is too much and bore is above the comb. The design should be that the rifle recoils straight back.
Improper shooting position. Shoulder should be pushed into the butt, putting forward pressure on the bipod legs (if it's a Harris type with the springs.)
Body position: This is arguable but I do best when the spine (mine) is lined up parallel to the line of bore. That is, straight behind the rifle. However this is difficult in the field unless the "hide" is set up for it.
Being a wimp I have a brake on my rifles (338 RUM Rem Factory. Custom 270 Allen Magnum) With the correct stock design and the brake the only shots I can't spot through the scope is when I've taken an improper shooting position.
Note that I don't use spring type bipods. I've machined my own out of aluminum. They are screwed solid to the forward sling nut.