I have always gotten my best results with the 300gr XTP bullets. I am currently loading them over 100gr (measured) Hodgdon 777.
*To the best of my knowledge, the XTP MAG bullets are only available in 45 cal, so be sure to use the correct sabot if you are changing over from a 44 cal sabot set-up.
I have not yet seen XTP MAG bullets w/sabots from Hornady; are they available together?
For shooting deer and black bear, I do not feel that there is any advantage to shooting XTP MAG bullets which I believe were designed for extreme pressure cartridges like the 454 Casull. Conventional XTP bullets would distort under the extreme pressures of these guns (50,000+PSI)and could cause damage to revolvers. The regular XTP bullets come with a small paper inside the box which indicates the velocity level that they are intended for.
VH