My dad has that combination. It shoots the Hornady SST's very well. His only complaint is that the rifled slug barrel makes the gun very heavy.

I on the other hand continue to shoot a 12g winchester smooth bore with the Foster slugs. Plenty accurate out to 75 yards, which is about the max range I could shoot at in the areas I hunt at. The big difference is that a box of Foster slugs runs about $2.50 and the Hornady SST's that the Mossbergis in the $22.50 range for five slugs.

Bob