A better question might be to ask how a downstream buyer should prepare himself to locate/buy Peterson brass when new production batches become available? [For 284 Win, am currently on notice from Graf & Son and shootingbot.com]
I think a lot of us are curious about how a specific brass maker's production cycles work in terms of how frequent certain cases are produced/scheduling/lead times and how to help captive buyers avoid missing the next opportunity... Some suppliers are helpful and transparent with availability timing, some are not. Note that I have never tried to contact Peterson Cartridge.