Yes, it will have tin and antimony in it. It would be very good for hunting as the balls will penitrate VERY well.
If you air cooled the balls they will be on the "harder side of medium".
If you water dropped them they will be very hard.
If you get them too hard you may have trouble with loading. You can go to a slightly thinner patch if it's too hard to load.
Also it you roll them between 2 rough surfaces, like a pieces of 80 grit metal cutting paper, you'll get a texture on them that grab the patch better, and that makes them very accurate even if they are hard and don't obdurate much.

happy hunting.