I use my 300 Win Mag almost exclusively for elk and black bear.
After lots of experimentation, I settled on IMR-4350 and a 180 grain bullet. All the powders I tried gave me good to excellent results, I just use 4350 in a variety of calibers. The 180 grain bullet was perfect for my 300 Win. It provided exceptional accuracy. I prefer the Nosler Partitions and Accubonds, but have recently purchased Barnes TSX's for reloading (have not yet had them to the range). I don't know why I needed to try the TSX's as every shot using the Noslers was a quick, one shot kill. I guess it's the obsessive/compulsive nature of shooters/reloaders.
After lots of experimentation, I settled on IMR-4350 and a 180 grain bullet. All the powders I tried gave me good to excellent results, I just use 4350 in a variety of calibers. The 180 grain bullet was perfect for my 300 Win. It provided exceptional accuracy. I prefer the Nosler Partitions and Accubonds, but have recently purchased Barnes TSX's for reloading (have not yet had them to the range). I don't know why I needed to try the TSX's as every shot using the Noslers was a quick, one shot kill. I guess it's the obsessive/compulsive nature of shooters/reloaders.