I have a Dillon 550b, I own around 10 tool heads, but only keep 7 with dies in them (45 ACP, 45 Colt, 44 mag, 38 Special, 357 Sig, 9mm Lugar, 300 Blackout) I keep a few spares for the other 111 cartridges. I only have 4 Dillon powder drops, one push bar (from 1984!) and 3 case mouth activated. I keep the shell plates and powder funnels in their little blue boxes, and the loaded tool heads in a filing cabinet drawer, along with all my odd accessories. When I'm actively using a tool head, I leave a powder drop on it. If I want to interrupt that for a while, I leave the powder in it and place the entire set up on a wide mouth plastic gallon jar. (If I'm Using a powder measure, it has a label on it stating powder and weight and Cartridge, even though the dedicated tool heads state the cartridge) I can have 4 active at a time. I hate changing the primer feed, so I load everything I can of one size then switch to the other. If I load 45 Colt, followed by 44-40, 44 Mag, Special or Russian, I don't have to change the shell plates. Same with 9mm Lugar, 9mm Largo, 380, 30 Mauser, 300 Blackout or 223 Rem. Another "family" is 40 S&W, 10mm, 357 Sig, & 7.62x39 (but there is a primer size change.) (I don't mess with 40 or 10mm, but 2 B-I-L's do)

Ivan