Right now I only have a 556 and a 300 blackout. 556 is for plunking fun mostly. 300blk is for fun shooting suppressed. I use the 556 a lot more.
I do want to get a 458 socom or a 50 Beowulf at some point just for big bore fun. Wouldnt shoot it often but be fun to do from time to time. It's just in spot 7 or so of guns to buy right now