ehhh...well, having said that...yes, .40 Short & Weak caps will work in a 10mm.
I've had horrible luck with the Armsport and similar caps (red or blue plastic with brass head and plunger/primer). My favorites are the AZoom caps that I believe Lyman is now distributing -- black aluminum with a primer pocket filled with something that looks like silicone caulk. Indestructible. Wish they were something other than black, but I can live with it.
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