What was a cartridge developed for the Browning .50 caliber machine gun in the late 1910, was banned in California which led to the adoption of a French rifle cartridge developed by Eric Danis? 
.510 DTC EUROP:  In response to the .50 Caliber BMG Regulation Act of 2004, which banned future sales of .50 BMG shoulder-fired rifles in California, long-range shooters in that state have begun to adopt this cartridge as a manner of following the new legislation. .50 BMG: The .50 Browning Machine Gun (.50 BMG, 12.7×99mm NATO and designated as the 50 Browning by the C.I.P.) is a cartridge developed for the Browning .50 caliber machine gun in the late 1910s.
i don't know