Bore Butter is a definte no no....don't use it. A very light coat of oil is okay for storage but otherwise just leave the barrel dry.
I take it you are shooting a .50 calibre muzzleloader? If then, either size bullet is fine as long as it is being used with the proper .50 cal sabot. There has been a real move away from .45 calibre hollow-point bullets in recent times and a growing popularity in .44 calibre bullets. She quite likely didn't get the wrong thing...that's likely all they had. While the .45 calibre XTPs were only designed to be shot with a maximum of 100 grains of powder, the .44 calibre XTPs are likely equipped with the black sabots and will work with 150 grain powder charges.
If you were looking for SSTs though, then there is a real difference in performance between the two bullets. The XTPs were a good bullet in their day but are no where near to SSTs in ballistic coefficient and in performance.
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