Gun Digest presents . Cartridges of the AR-15! Noted gun writer and AR-15 expert Patrick Sweeney lays out the ever-increasing field of AR-15 cartridges. Whether you're interested in AR-15s for home defense, long-range shooting, or hunting, there is surely a cartridge that meets your needs. Sweeney covers them all, from the 5.56 NATO/.223 Rem., to rimfires like .22LR, up to the .

300 AAC Blackout, 7.62x40 Wilson, 6.5 Grendel, .264 LBC, .30 Remington AR, .300 Win. Mag., .

338 Federal, .450 Bushmaster and many, many more! -- Patrick Sweeney.