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<p>[QUOTE=&quot;springfld.arsenal, post: 309338, member: 54&quot;]Haven’t seen these before but using the 0.470 body diameter I’ll try to match it to something.&nbsp; Only cartridge I found with that diameter was the .410 shotgun shell (base portion,) so maybe these have something to do with .410 shotgun repair, maintenance, training or are checking gauges for a production line inspector. If rim diameter and thickness match these specs then I probably guessed right.</p><p><br /></p><p>.410 specs</p><p><br /></p><p><b>Base diameter</b> .470 in (11.9 mm)</p><p><b>Rim diameter</b> .535 in (13.6 mm)</p><p><b>Rim thickness</b> .060 in (1.5 mm)[/QUOTE]</p><p><br /></p>

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