Just contact Bullshop and have him make you up some Goulds in .452 out of pure lead. They will weigh about 345gr. Shoot them with no more that about 70-75gr by volume of powder. Those will whack any deer within 125yards no sweat. Without knowing the actual land size of the rifle you got the .452 is the best guess. You might need .451 but Lee sells a cheap die for under $25 in .451.
Are those the ones that are being shot with paper patches? I've been watching a bunch of you tube videos on paper patched bull shops and am excited seeing the accuracy. I just don't know how those would do packing them around in the woods for several miles a day for days on end before getting a shot, they seem pretty loose in the barrel for that.