I have a RMC flintlock that is 1/28" twist. This rifle can use only Black powder and I have been using 2f Goex. What would be my best choice of saboted bullets for whitetail deer with shots out to 120 yards maximum. I have tried the 250 and 300 grain Hornady xtp's and they shoot pretty good but I am wondering which would be a better choice considering the lower velocity of Black powder. I would be shooting 100 grains of 2f. What do you think 250 or 300? What are your opinions on 3f in this 50 caliber? Would an even lighter bullet be a better choice?