I just hold the gun lightly against my (right) shoulder.... usually with my left hand under the toe of the butt, acting like an adjustable shim.... I find it generally works best with the roller a bit ahead of the balance point of the rifle.... but of course all springers have their own favourite way of being held.... I just found the groups tightened up with the roller.... and as an added benefit the POI was closer to where it is offhand as well....Bob
Rest your thumb lightly at the top of the stock directly behind the trigger it makes it easier not to twist the rifle