Starline Unprimed Brass Cases 300 Blackout (100pk) - RN Caliber_35 Whelen 56x45mm case that is necked

56x45mm case that is necked to

Universal magazine design

Fits the following calibers in the bullet up or down position:

Very Good Condition despite a bit of rust underneath it

Starline Unprimed Brass Cases 300 Blackout (100pk) - RN Caliber_35 Whelen 56x45mm case that is neckedAKA . 300 AAC Blackout, . 300 BLK, 7. 62x35mm1. 356 1. 360 O. A. L. The . 300 Blackout is based off of a shortened 5. 56x45mm case that is necked to . 30 calibre. For AR 15 platform rifles and pistols it only requires changing the barrel to go from 5. 56 to . 300 Blackout. The Blackout's main purpose is to be used at subsonic velocities in suppressed firearms. Many bolt action and single shot rifles are now being produced in this calibre as well.