Depending on the make of the rifle, these three things will improve your accuacy. 1) Practice with the rifle you have choosen. You can never get enought. 2) Sights. If you will be using a scope, get one designed for the type of rifle you have. Don't put a twenty dollar w-mart .22 glasser on a 30.06, nor should you put a scope for a moderate round like the 30-06 on a magnum grade shooter like a .338 win mag. If you are going to use open sights, the best are of an aperture design, that is a small hole to look through at the rear and a good sight post front. 3) More practice. Like more bells and whistles on a car won't make you a better drive, more "things" put to a rifle won't make you a better shot. That said, if the above items have been done well there are items of interest that can be done to the rifle to make it a more stable platform. Bedding the barrel and action, gaurentees no recoil wiggle, crowning the muzzle, keeps the bullet in contact with the lands and groves for the full length of barrel which in turn keeps the bullet path truer longer, lapping the barrel, very time consuming to do it corretly but provides the bullet a near glass smooth path further stabilizing it. But the fundamentals must be gotten down first, practice-sights and sight picture-practice.