.41 Short rimfire cases, does anyone now the final thickness of the rim and base, as if you were to examine a case that was cut longitudinally and could measure the copper thickness at the rim. I want to try my hand at forming these cases, i think it would be neat to recreate something like that. I don't even have a firearm in this caliber...although there is a neat old Remington derringer at the local pawn shop....