I agree with border, get used to your gun and stay with it. I do a ton of waterfowl hunting, as well as high house-low house skeet. I've competed in several local invitational shoots and even won several, routinly breaking 24 and 25 out of 25. All of these were with a Benelli M1 super90.
IMO, it doesnt matter what you shoot. A $200 single shot H&R can throw lead in the same way as that $2000 O/U. What ever you shoot, shoot it, be familiar with it, CLEAN IT, and have fun.