I'd stock up on brass. The only certain future supply you'll be able to bank on with absolute certainty is the brass you'll buy today and keep in reserve.

I believe in this practice anyway, even with popular chamberings such as the 270 Win., 300 Win. Mag., and 375 H&H. I must have 5,000 or more new, unfired cases in certain calibers, and I don't feel the least bit bad about it, either.....