Bore / Caliber
Bore is the internal diameter of the barrel. Caliber is that diameter expressed in inches (.32, .38) or millimetres (9 mm, 7.62 mm). Shotgun gauge is the inverse measure (smaller gauge number means larger bore).
Bore is the internal diameter of the barrel. Caliber is that diameter expressed in inches (.32, .38) or millimetres (9 mm, 7.62 mm). Shotgun gauge is the inverse measure (smaller gauge number means larger bore).
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