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A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
In Bohemia, one měřice was equal to 1999 m 2. [1] 1 korec (also known as the strych or the míra) was equal to 2878 m 2. [1] [3] 1 jitro = 2 korec 1 lán = 60 korec.