I work in a gun shop and most of the weapon manufacturers recommend CCI Mini Mags. They are listed as around 1600 fps which provides the power to cycle the bolts or slides on anything.
However, I have found that if you run CCI mini Mags during break in (400 about rnds) everything gets worn in...
I bought the SRII combo 20/28ga a couple of months ago. Got to shoot 400 clays before shoulder surgery and it was flawless. Swung great on doubles, just a small issue figuring out the alignment on the lower barrel. I'll pattern it after rehab. But so far no problems, other than the loose nut...