Filepe, I have a couple of boxes (20 to the box in the sabot slugs). They work ok thru my old S & W pump, and are supposed to work in the Winchester pumps (1200's maybe), as well as the old 1897 style pumps. They would also work well in break opens. since the slugs are non rifled, they would need to be counted on at close range. They are very low recoil. They are kind of gimmicky, maybe the bird shot would have more pratical use for shooting pidgeons up close. I really don't know why I'd use the slugs other than in a house, they wouldn't have as much wall penetration as a 1 oz slug. The box does not give the weight of the slugs. I did cut one open one time, and while I didn't weigh it, I seem to remember it being 5/8 oz. I think my regualar tube hold 4 2 3/4 " and would hold 6 of these.