I just ordered a box of nitro ammo in 4x5copper x 7 hevi shot according to ray at nitro these are some wicked loads Ray said that with my moss835 i should get 340-380 pellets in a ten inch circle at 40 yds and with my 870 I should get 260-280 im using Rhino choke tubes which they recomend When the weather gets warmer ill let you know how they do they are expensive but if they perform who cares