This is the latest AR-15 compatible offering from Hornandy. It's touted as being very accurate with 1000 yd capability ( with 105-108 grn bullets ). There is no load data out yet but the case dimensions are VERY close to the 6BR i shoot out of one of my custom savages which shoots .250" groups at 100 yds with boring regularity.
I've got an armalite M-15 target rifle that shoots .750" groups pretty consistently with federal GMM, not bad for a stock auto-loader. If the 6mmARC can get that under .500" i might build one.
Not real sure about feeding out of a magazine, it's a short fat cartridge that shoots long bullets, i've heard from folks these don't work well in auto-loaders
Hornady has been busy lately the 6.5 creedmore has taken the market by storm (even bad shooters can get sub 1'' groups) if this cartridge can match that reputation a lot of guys are going to buy all new loading dies
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