As stated I would switch to the standard and not use the Mag.They are for faster speeds then you will see out of your Muzzle loader.I asked Hornady the same thing a while back and got a great responce from them,wish I saved it to copy it for you.But you get the speed idea.They are actually two different style bullets on the nose of it.I have noticed them along with every other bullet going up in price.Try Graffs,wholesale hunter or even Cabelas.

I was going to use the .452 300gr XTP this year as my hunting round but I am going to stick to ole faithfull 350gr FPB.

Steve