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Per the link above, the use of "bore" is a English/European tradition, "Gauge" being the more common American usage where 410 bore is often referred to as 410 Gauge by the uninitiated lol

Not wanting to argue with you, however, all of my reading/research forever, and I have done a bit, is that the correct references are 12 gauge, 10 gauge, 20 gauge etc, but .410 Bore is the correct...

With apologies for hijacking thread...but those with relevant knowledge seem to be gathered...are there any reasons why not to use CBC brass hulls with modern smokeless powders in current shotguns? I...