Developed by Rigby ca 1927 by necking down the 375 2¼” Flanged. This cartridge is similiar to the 7mm Holland Flanged Magnum, but with thicker rim.
Developed by Rigby ca 1927 by necking down the 375 2¼” Flanged. This cartridge is similiar to the 7mm Holland Flanged Magnum, but with thicker rim.