HBR (Hunter Bench Rest) class cartridge named for gunsmith Stan Ware, it is basically a 308 Winchester case shortened .165″, retaining the 20-degree shoulder angle but with the neck shortened .025″ resulting in a C/L of 1.830″. It is very similar in appearance to the older 30 x 47 benchrest cartridge and even older 308 x 1.850″ wildcat. There was an article in IAA Journal 447 (Jan/Feb 2006)