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The caliber (CAL .45, CAL .30, or CAL .50) was painted in bold lettering in the upper left corner. The gross weight of the box in pounds and its volume in cubic feet was painted in the lower left corner and the Ammunition Lot information (manufacturer code and lot number) was painted in the lower right corner.
(For example, the United States uses the NCB codes 00 and 01 and Canada was assigned 20 and 21; the first number was for pre-1975 production and the second for 1975 and later production.) The 7-digit code number that follows is the unique 3-digit interfix number and 4-digit sequence number of the item.
The pre-war headstamp has the 1- or 2-letter code for the brass supplier of the cartridge case at 6 o'clock, the 2-digit year the cartridge case was produced at 12 o'clock, the lot number of the propellant at 9 o'clock, and the 2-digit year the finished cartridge was assembled at 3 o'clock. The brass suppliers or cartridge manufacturers would ...
The most common rimfire cartridges are chambered for .17 caliber and .22 caliber. The bullet diameter for .17 caliber firearms generally measure .172 inch (4.37 mm), while the bullet diameter for .22 caliber firearms generally measure .222 inch (5.64 mm).
The 226 Express subvariant, reduces shoulder and neck diameter with a long, slender body taper on the 30-06 case. [6] Experimentation during the mid-20th century indicated no practical benefit from the incremental volume increase of the 63 mm-long 30-06 case over the 57 mm-long 7mm Mauser case for .22 caliber bullets. [7]
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Cartridge adapters have also been made to use .38 caliber handgun cartridges with bullet diameters of approximately .357-inch (9.1 mm) in .35 caliber rifles designed for bullets of .358-inch (9.1 mm) diameter. [3] Supplemental chambers in .22 caliber, and potentially .17 caliber as well, pose a special problem not shared by larger calibers.
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