Introduced in 1907, this rimmed and slightly necked cartridge was introduced in response to the ban in some colonial areas of 0.45 calibre rifles. Using 0.467 – 0.468″ diameter bullets of 480 gr weight, this is a specialized round. The headstamp on the brass is different but it was made by Bertram. This brass is packaged in lots of 20. Shipping weight is 455 g/20 cases.