View Full Version : Exact dimension of .410 shell

11-27-2006, 12:19 PM
Does anyone have a reference to the exact dimensions of a .410 shotgun shell? I'm only interested in the "base", in particular the rim diameter and height.

Why am I asking: Because I got a steel shotshell adapter to run .22LR shotshells in my .410 shotgun. And it doesn't quite fit: It loads just fine into the chamber, but the break-open shotgun doesn't quite close. I suspect that the rim is the correct diameter, but a little too high. But then, maybe my break-open is out of spec, but happens to work with commercial brass bases on shotshells, and I need to file the extractor a little bit.

I tried web searches, and neither google, ammoguide nor SAAMI had any information.

11-27-2006, 12:23 PM
67 0.410 0.465 - 2.50 65 0.537 0.060 0.015 0.4375 12.5 0.415


Prolly in there somewhere.