I heard about a muzzleloader sst bullet from hornady. Is it avalible? Anyone tryed it and how does it work?

I shot a box of them in the 250 gr the other day and believe they are going to do very good with the right load,shot some using 2 50 gr pellets of pyrodex,and 100 and 110 gr of pyrodex select,shot some swabbing the barrel after each shot some without,and at 100 yds everyone I shot was in a group I would say smaller than an ornge.I am waiting on the 200 gr to try but haven't seem them yet.T/C has the same bullet (looks the same except with a yellow tip on it,they come 15 to a box and were $9.50(Midsouth has them a lot cheaper)and the SST's were 20 to a box at $9.99.sent Hornady a e-mail to see when the 200 gr would be out but haven't heard from them yet.Want to try them in a encore 45 and 50 cal barrel.