It is not identical. Since the normalization at the beginning of the 21st century there are 2 cartridges , the 12,7x70 Schüler and the 500 Jeffery. Whoever buys ammunition has to be careful. My rifle was built in the late nineties before the standardization and would be rather a 500 Romey Hybrid. http://www.cartridgecollector.net/500-jeffery I load my 500 Schüler with a 535gr FMJ bullet from Woodleigh and 127,4gr of R 904 powder from Rottweil to reach the muzzle velocity of 2400 fts.