I just bought a 45 Lc mtn gun. I'd like to run a bullet like this as my main one. I was thinking maybe a 260g wide flat but 280 is close enough. I have a lot to learn about casting and currently just own a few Lee molds.

Which one of these would be the one to get? Brass or aluminum and how many cavities? I don't want gas checks just lead. I'm not going to run them too fast. Maybe 1100 fps max. Do the 5 cavity molds work well? Would I be better off going 3 or 4 for keeping temps right for good casting? Is it more difficult to cast the hollow points?

Thanks,
Bb