I too would like to blame my misses on my shotgun.....but that would be very unrealistic.....I miss because I don't point the gun in the right place when I pull the trigger.....

Take your gun to a range and pattern the barrels to prove to yourself that the culprit is not the gun.....or that it is if that's the case.......but you won't shoot better if you don't work on the real problem.......It's likely the person holding the gun.