While doing some case belling last night, I found a primer dropped in with the 32 ACP brass. Apparently I had dropped it, some time ago, and it had fallen in that box, and I was unable to locate it. So, there it is. Large primer, but rifle or pistol? Makes a difference, I've always heard. Hmmm. Take calipers and measure it. Height of 0.120 inches. Take brand new CCI LP primer out of box. Also 0.120 inches. Great. LP primer, quickly shove it in convenient 41 magnum case, so it don't get lost, and get on with belling the 32s. Oops. Found another one. Measure it. 0.122 inches. Hmmm. That a rifle or a pistol? I thought the difference was greater than that. I start searching the web for information. Lots of sites that say LR is taller than LP, but no dimensions. Then I find a site that gives LR and SR dimensions. But it says that LR is 0.118 tall. That ain't no good. I already know that LP is 0.120. Leastways,s the CCI LP that I have is 0.120. Hmmm. So, I start writing this post, to ask others' opinions. Then I have a brilliant thought. Measure the depth of rifle and pistol primer pockets. Go get my trusty caliper. Dig out three various rifle cases. They are, in case anyone is interested, a 30/06, a 25/06 and a 308. Primer pocket depths are, in that order, 0.126, 0.127 and 0.127. Measure some more of the convenient 41 magnum cases (brand new box of unprimed brass). Measure two of them. Both 0.122. Hmmm. Now, I know the intelligent thing is to load the primer into a rifle case, load the case into a gun, pop the primer and go on with life. It's just a lousy 3 cent primer. But I'm curious. Does anyone know what the accurate height dimensions are for a Large Rifle and a Large Pistol primer? Oh, and by the way. This is probably going to turn out to be a rifle case, as it is the exact same height as the pistol pocket, so there could be no setting it under flush. But I still want to know.