Id reccomend Federal HW #7s.Other than TSS its the best load available for 20ga. No longbeards in 20 ga yet. IMO,There's a bunch of chokes for less than half the price of jebs that do very well with HW 7s.But, if you want the most holes in the 10" @40, the Jebs would be a safe bet.560-.582 chokes do well along with factory full choke.Also I'd reccomend trigger work be done as most Mossberg pumps have mushy, heavy triggers.Good luck and let us know what you go with.