2400 is still one of the best for magnum loads. Aliant did come out with that 300-MP not too long ago. It is designed for magnum handgun loads. But it is not in any of the reloading manuals yet so we'll have to wait until the next editions to see it there. Unfortunately, Aliant's reloading data on their website is pretty much useless. So I'm waiting to try it until the data shows up elsewhere.
H110/Win 296 is another good choice as well.