A few months ago I was running some shells through my Mossberg 500A 12 gauge -- not firing it, just running some ammunition through the action after having cleaned it and given it a bit of lube. This gun had never jammed or experienced any kind of feeding failure of any kind, so I was greatly disappointed when one of the shells failed to eject properly. Then, upon inspecting the offending shell more closely, I saw the problem -- it was a 16 gauge shell (for my H&R Topper 16 gauge single shot) which had gotten mixed in with a box of 12 gauge ammo. Woops! I immediately took steps to prevent this from occurring again by laboriously writing "16" on the brass of every 16 gauge shell I owned with a Sharpie pen. But this could have been avoided altogether if the ammo makers would color code 16 gauge shells the way they do 20 gauge ammo (which, as I'm sure you know, is all yellow). Seems to me that all 16 gauge shells used to be purple (correct me if I'm wrong), but they aren't color coded at all anymore. Anyway, do you all think 16 gauge shells should be color coded by the ammo makers, or that it's not that big of a deal? (I assume 16 gauge shells can't get stuck halfway down a 12 gauge barrel the way 20's can, so maybe it's not quite as dangerous). What do you think?