Definately like Art said, there is no ballistic advantage with a 28 over a 24 or 21". If you can, shoot one of each to see which one you like the best. And just like anyother gun, you will have to experiment with chokes to find the best patterning combo (choke & barrel) that you have. I hunted turkeys this year with my M500 with a 28" accu-choke vent rib barrel and a leapold 3x9 and a TruLock full turkey choke. I used the 28" barrel because, thats what I had! For the Fall season I do feel a 24" becoming part of the family though.