I have not examined the specs on the various .45 Colt ~ dash ~ .410 Revolvers...but, what is going on there as far as Barrel Bore diameter in relation to the Diameter of a .410 Slug?
Isn't a .410 Slug .410 in diameter" ?
Which if so, wouldn't it be right for .41 Magnum? but way too small for .45 Colt?