Hi , my current smoke pole is a firestorm , I used to use the hornady 240 gr xtp loads in my 50 cal.
Long story short , try them in cold weather before you rely on them.
I found out my sabots were breaking up in slightly cold weather , causing the bullets to fly extremely wild even at 25yds.
It was not a bad batch of bullets , I tried many different lots,etc,etc,etc , and I looked into this enough and have dealt with this so long you can set your watch by it.
On the other hand they do work nice in warm weather.
Hornady was of no help on the problem and said they never heard of this , hornady also told me the magnum 240gr xtps are different from the ones sold to load in your 44mag , hornady told me they have a thicker jacket for the increased speeds of the muzzleloaders , this is what they said to me about 2 1/2 yrs ago