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2. 12.7 × 108 mm - Wikipedia

   en.wikipedia.org/wiki/12.7_×_108_mm

   The 12.7 × 108 mm has 22.72 ml (350 grains) H 2 O cartridge case capacity. 12.7 × 108 mm maximum cartridge dimensions. [citation needed] All sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 18.16 degrees. According to guidelines the 12.7 × 108 mm case can handle up to 360 MPa (52,213 psi) piezo pressure.

3. Talk:12.7 × 108 mm - Wikipedia

   en.wikipedia.org/wiki/Talk:12.7_×_108_mm

   Of note we see it uses a short 840mm barrel for the 50 BMG round and a longer 1000mm for the 12.7 x 108 mm round. The factory specification and listed velocity in for 12.7 x 108 mm in that article is still 68 m/s slower even with the longer barrel than the 50 BMG and its shorter barrel.

4. List of cartridges by caliber - Wikipedia

   en.wikipedia.org/wiki/List_of_cartridges_by_caliber

   Calibers in the size range of (mm, inches): 2 mm (.079+ caliber) ... Table of handgun and rifle cartridges; By name. List of Winchester Center Fire cartridges;

5. 12 mm caliber - Wikipedia

   en.wikipedia.org/wiki/12_mm_caliber

   This is a list of firearm cartridges which have bullets in the 12 millimetres (0.47 in) to 12.99 millimetres (0.511 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge. Bullet refers to the diameter of the bullet. Some measurements are in millimetres, while others are measured in inches.

6. .50 BMG - Wikipedia

   en.wikipedia.org/wiki/.50_BMG

   The specified maximum diameter of an unfired .50 BMG bullet is 0.510-inch (13.0 mm); while this appears to be over the .50 inch (12.7 mm) maximum allowed for non-sporting Title I firearms under the U.S. National Firearms Act, the barrel of a .50 BMG rifle is only .50 inch (12.7 mm) across the rifling lands and slightly larger in the grooves ...

7. Caliber - Wikipedia

   en.wikipedia.org/wiki/Caliber

   While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. [citation needed] For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any ...