David,
I cast for my BC with a hollow base mold. I use my own alloy most of the time, that is a little softer than WW, but WW would be fine as cast as well. I use either a home made pan lube, or Alox dependent on how hot I'm loading. I've shot these up to about 1700 fps with no leading problems, and good accuracy. They will shoot best at a little slower speed, IMO around 1300 or so. I get less than 2" groups at 100 with this bullet in 405 grns. If I'm having a good day and no win and I'm not tired or shaky, I can get that to an inch or less. With a .458 bullet, that's almost one bit hole.
Best of luck. Most any alloy you try with the hollow base will shoot adequately. Bear in mind, I've only punch paper, so I don't know how it would fare on game, but if not too hard, it should be fine.
Ben