I had Steve Brooks make a second mould with the HP that is identical to the .50 Creedmoor bullet mainly to reduce the weight but keep all dimensions the same. I don't remember for sure what the HP took off for weight without casting some but I think it dropped the weight from 718 down to 685 gr. Not much difference but the HP tightened the groups a smidge. If you want to save the meat loss from a bad hit I would not use the HP for hunting unless you cast them with #2 Lyman
The Big .50 is really not needed for Buffalo as much as I like this caliber. The .44-77 will work just fine. Just don't put the shot behind the ear if your a head hunter.