Metric System (1917)
After the October Revolution, the first change in this new system took place, when Soviet Union officially adopted the metric system and abolished old non-metric measurement units. From this point until the present caliber is expressed in millimeters; the fractional part of the caliber was rounded to the nearest integer value. In some cases, the attributes were simplified. Examples of these modified designations include 76-мм дивизионная пушка обр. 1902 г. (76 mm divisional gun M1902, formerly 3-inch divisional gun M1902) or 152-мм пушка обр. 1910 года (152 mm gun M1910, formerly 6-inch siege gun M1910).
Read more about this topic: Designations Of Russian Artillery
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