As used in this part, “.50 BMG cartridge” means a cartridge that is designed and intended to be fired from a center fire rifle and that meets all of the following criteria:
- (a) It has an overall length of 5.54 inches from the base to the tip of the bullet.
- (b) The bullet diameter for the cartridge is from .510 to, and including, .511 inch.
- (c) The case base diameter for the cartridge is from .800 inch to, and including, .804 inch.
- (d) The cartridge case length is 3.91 inches.