Imperial calibre notation
Calibre designation using decimal fractions of an inch, often with a name suffix indicating the designer or intended firearm (e.g. .45 ACP, .38 Special, .357 Magnum); standard in US commercial production.
Calibre designation using decimal fractions of an inch, often with a name suffix indicating the designer or intended firearm (e.g. .45 ACP, .38 Special, .357 Magnum); standard in US commercial production.
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