The 22 ARC is essentially a 6.5 Grendel that has been necked down to accept 22 calibre bullets to utilise the high BC, heavy for calibre bullets in .224″ diameter, as well as being able to push the lighter .224″ bullets faster than the .223 Rem.
This gives you a versatile cartridge for either long range target shooting or varmint hunting that works well in both bolt action and AR platform rifles.
