The single most important thing with a shotgun is to make sure the gun fits you. Shotguns lack a rear sight; it is the fit of the gun to the shooter that becomes the rear sight. Once you have a good stock fit, misses are mostly on the shooter (more shooting practice). Ammunition has a relatively minor effect. If you don't get a good gun fit, the shotgun will not hit where you are pointing it and no amount of practice will fix that. I would buy the ammunition with the best price, given it has the right shot size (Most clay shooting sports ranges specify the largest permitted shot size).
Last edited by shyguy; 11-12-2012 at 10:38..