it is a solid lead-chunk of bullet, that is stacked up in a 22 short case. Most rifles cannot shoot it, either the semi's can't handle the extreme short case, becuase the long lead bullet hangs up, or they can't eject. not enough oomph.
bolties can handle them no probs, but the problem is this; bbl twist. Most bbls do not have the right twist to shoot these at all, i mean instant keyhole when they leave the bbl. I have seen them put keyhole marks in paper, at 25 yds.
You can get custom bbls to shoot them, or you can get lucky, and find a rifle that shoots them well. For instance, the old remmy's with the floating chambers, or the ones designed to shoot short, long, long rifle, will do it.
I have a remmy speedmaster, that puts them in the same hole, at 50 yds.
the great thing about this round is the downrange ballistics; since it is under 1000fps, it does not suffer '22 drag syndrome', the way other 22 rounds do, that are supersonic. And since it is a full 60 grain monster, it really take s along time to slow down, if you hit something with this round, you will hear a serious 'WHACHHKKK' when contact is made.
The trick is finding a rifle that will shoot it...