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It is renowned for its large caliber, firing a 23 mm shotgun shell, equating to 6.278 gauge using the British and American standards of shotgun gauges and approximately 4 gauge using the current European standards (based on the metric CIP tables), making it the largest-bore shotgun in modern use.
The .410 and 23 mm are exceptions; they are actual bore sizes, not gauges. If the .410 bore and 23 mm diameters were measured using more traditional means, they would be equivalent to 67.62 gauge (.410 bore) and 6.278 gauge (23 mm), respectively.
32 gauge — .526 in (13.4 mm) 28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm) 2 bore ...
A bore gauge is a collective term for the tools that are unique to the process of accurately measuring ... 3 to 5 mm (0.118 to 0.197 in) 5 to 7.5 mm (0.197 to 0.295 ...
The .410 bore is the smallest shotgun size which is widely available commercially in the United States. For size comparison purposes, the .410, when measured by gauge, would be around 67- or 68-gauge (it is 67.62-gauge), The .410 is often mistakenly assigned 36-gauge. The 36 gauge had a 0.506" bore. Reloading components are still available.
This latter figure has been extracted from a very busy table and is provided solely to indicate a rationale for the manufacturer's selection of 23 mm as the bore size and the use of the term '4 bore' in trade literature when developing a shotgun to fire a cartridge larger than existing 12 or 10 gauge cartridges.