Rounds jam - Alexander Arms .50 Beowulf 4 Rounds Magazine

I purchased the 4-round mag as the 7-round is not needed for hunting wild hogs. The magazine feeds the first two rounds, but the last two rounds do not clear the magazine. The casings of the last two rounds hit the front edge of the mag and then jam. It appears the front edge of the mag is too tall, causing the casing to hit and jam. I considered using a Dremel tool to remove some of the lower edge of the mag; however, I decided not to attempt any repair.