I have to admit, I have never really did this until today. I only had Federal shotshells and one box of Remington HD #2 shot. The Federal were 2 3/4" #3's, 3" #2, 3" BBB, 3.5" BB. The gun a Mossberg 835. shot distance 38 yards

First round was with the Improved Cly only size that showed promise was the 3" BBB

next was the Modified choke, The 3" BBB still came out on top with the #2 steel close second.

Now the Full choke, 3.5" BB then the #2 steel and BBB second, the 3.5" BB had the most in the middle followed by the #2 and BBB and the BBB was better than the #2's.

To be honest I expected to see more shot in the middle than what I saw. The average for all three shot sizes was 20 to 21 pellets. But at least I know what to shoot and choke size to use now.