Thanks for all the input. I don't want to regulate the rifle off the sled. But I do want to know why some folk claim they are death on stocks. For example, lets say I have a .375 double which has a QD scope. I want to sight the left barrel in off the sled ( then freehand to check). Why should the stock suffer ? maybe hundreds of rounds I could fathom but otherwise the physics make no sense to me. best, Mike

(also why not sight the scope into the middle of both barrel groups at 100 yds ? sorry if I am being an idiot.)