There’s a lot which can be accomplished by the many ~2.3” cartridges designed for use in the AR-15. Want to shoot 600 yards after prairie dogs and coyotes? 17 Rem, 204 Ruger, 223/5.56. Want to hunt deer and hogs to 600yrds? 6.8 SPC, 243 LBC, 6 WOA, and 6.5 Grendel. Want a short range hammer for deer and hogs? 350 Legend, 450 Bushmaster, 458 socom...
I have had several other cartridges in the past, but currently my hunting AR’s are chambered in 204 Ruger, 5.56, 243 LBC, 6.5 Grendel, 6.8 spc, and 458 Socom. I’m thinking about a couple “spite builds” this year, in .224 Valkyrie and .350 Legend.