Howdy folks: Does anyone know the history behind the 410 shotshell? Like when it appeared and in what gun and chamber length? Then just how the progression went regarding hull lengths on this gauge? How many were there? And reasons for each length as well as what today is considered to be commercially available for the 410. I know about the 2.5 and 3 inch, but are there others available now? Any short help or long history lesson would certainly be appreciated. Smithy.