In spite of the name, this cartridge is actually a German design from the early 1900s, where it was referred to as the 12.7 X 70 Schuler. It is similar to the 505 Gibbs but uses a 0.510″ bullet, rather than a 0.505″ as does the Gibbs. This brass is packaged in lots of 20. Shipping weight is 450 g/20 cases.