I used #4's this year for my gobbler. I've killed them with 4's, 5's,6's and duplex loads of 4x6. They all work. But it seems I go back to 4's most times. I shoot my old Remington 870 2 3/4" 12 guage. It has a 30" barrel. I bought it back in 1970 with money earned by delivering newspapers after school.