During the late '50's, the United States Army Marksmanship Training Unit experimented with large capacity cases for long range targets. The cartridge case that was selected was very close to the Ackley Imp .300 mag.
in the photo #1 is headstamped REM-UMC 300 indicating the bunter was modified.
The cartridge in photo #2 is headstamped W C C 60
The third cartridge is a factory REM-UMC 300 MAGNUM
in the photo #1 is headstamped REM-UMC 300 indicating the bunter was modified.
The cartridge in photo #2 is headstamped W C C 60
The third cartridge is a factory REM-UMC 300 MAGNUM

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