I'm loading for four gauges now on two different P-W presses. I load 12 and .410 on an 800+ and 20, and 28, on a 375C. I have the ability to load all four on the 800+, but I don't shoot as much of the other gauges. The only reason I load .410 on the 800 is I don't have tooling for the 375C.
If you decide to pick up components and start to reload, beware of scam sites. They're everywhere. If the site has everything in stock at low prices, run away. No one has everything, and prices are inflated. Try to stick to the major retailers that we all know. Graf's, Powder Valley, Recobs, Precision Reloading, CAC, BPI, to name a few. If you do have to pay shipping, and hazmat, it's sometimes cheaper in the long run to buy all the hazmat items from one place even if the prices are slightly higher.
Right now, I'm in search of shot. I got a lead from CAC this morning about a dealer an hour ish away. Better than paying $20 for two bags to be shipped.