For those of you interested, this is the new Rem 6.8 SPC round the military is talking about adopting for better performance over the .223. It is adapted from the old .30 Rem case, with a 115gr .277 cal. bullet and a case head of .418 as measured from these rounds. Over all length of the rounds in this box measured from 2.232 to 2.243. They are suppose to fit current AR mags. Velocity is suppose to be about 2650 fps from a 20" barrel and about 2800 from a 24. At 2800, it may make good predator cartridge. We shall see.
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52gr. .223 Center with 6.8 Rem SPC on each side for comparison.
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52gr. .223 Center with 6.8 Rem SPC on each side for comparison.