Wouldn't it be foolhardy to use unusual holds to sight in and work loads on a rifle that is meant to be shot from field positions. surely you would/could not install a bipod. Thinking of hasty sling, have not tested the change in impact but now think i need to.
I agree, that is why I don't use any "special" holds, and hold the rifle in both hands, buttplate firmly against the shoulder, when sighting in, just as I would do in the field. Not resting the fore-end directly on the rest, because I won't do that in the field, for example.
I also pay attention to the same things that I do when shooting from field positions, such as consistency of the position of the butt, cheek weld etc. Not "special" holds, but good technique.
Very light rifles seem particularly sensitive to this (as are rimfires, FWIW)
