I have an Endeavor, the only difference is the stock.
It shoots many things well the two loads that shoot the best are the 200gr 50/40 Lehigh And the Shock Wave 200gr 50 / 40. The best way to check for the load that YOUR gun will shoot best is to start at 100 gr and go up until the group starts to spread out. You will find that because of barrel whip that two identical guns may shoot different loads better. I have tried many powders and the best results consistently come from Blackhorn 209 with Winchester primers. An other thing that you should know, barrel tolerances for muzzleloaders are large and sabots come with different thickness of petals so you may want to try an assortment to get the best answer for accuracy.