This is a .50 cal. Browning case necked to .30 cal. For ballistic tests. It resembles the specimen 829(b) on page 553 of HWS 3, but has a shorter case. Apparently, these were done by Aberdeen Proving Ground.
CAL. 50/30 HV TEST
This is a .50 cal. Browning case necked to .30 cal. For ballistic tests. It resembles the specimen 829(b) on page 553 of HWS 3, but has a shorter case. Apparently, these were done by Aberdeen Proving Ground.