Caliber
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In guns, particularly firearms, but not artillery, where a different definition may apply, caliber is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bo
7.92 mm caliber rifle barrel (Mauser m/96)
Rifle cartridges: from left: 50 BMG • 300 Win Mag • 308 Winchester • 7.62 × 39 mm • 5.56 × 45 mm NATO • 22 LR
A 45 ACP hollowpoint (Federal HST) with two 22 LR cartridges for comparison
.44 Special
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The.44 Smith & Wesson Special, also commonly known as.44 S&W Special,.44 Special,.44 Spl,.44 Spc, or 10.9×29mmR, is a smokeless powder center fire metallic revolver cartridge developed by Smith & Wess
Charter Arms Bulldog with five .44 Special 246 gr LRN cartridges
Black Powder Factory Cartridges c. 1907—20
Keith Semi-Wadcutter Hollow Point developed by Elmer Keith and Harold Croft (c. 1929–1931)
.40 S&W, .38-40, .44 Special, and .45 ACP