Gauge (firearms) - Wikipedia
The below table lists various gauge sizes with weights. The bores marked are found in punt guns and rare weapons only. However, 4 gauge were sometimes found used in blunderbuss guns made for coach defense and protection against piracy. The .410 and 23mm are exceptions; they are actual bore sizes, not gauges. If the .410 and 23mm were measured traditionally, they would be 67.62 gauge and 6.278 gauge, respectively.
DA: 88 PA: 28 MOZ Rank: 26