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Consider a 30-30 rifle cartridge, which has been around since the early days of smokeless powder. The name designation has significance in that it refers to having a 30 caliber bullet on 30 grains of smokeless powder. The 30-40 Kraig military cartridge comes from the same naming convention, a 30 caliber bullet on 40 grains of smokeless powder. This naming convention is no longer used.Consider a 30-30 rifle cartridge, which has been around since the early days of smokeless powder. It was designed for smokeless powder and introduced in 1895. The name designation has significance in that it refers to having a 30 caliber bullet on 30 grains of smokeless powder. The 30-40 Kraig military cartridge comes from the same naming convention, a 30 caliber bullet on 40 grains of smokeless powder. This naming convention is no longer used.