Looking for some advice, I would like to carry the 20 for turkeys this spring. I have a youth model 870 with a 21 inch barrel and it has a .575 Carlson Non Ported turkey choke. I want to shoot Winchester Long beards out of the gun but not sure if I would like to try 5 or 6 shot, I also have a few Hevi 7s to try. Any advice welcomed...Thanks