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Most factory rounds I've seen have brass-coloured primers. The only brass-coloured primers available to the reloader are Winchesters. CCI, Federal and Remington are silver.
Winchester .45 185gr NT use small silver primers also.
I think the companies mix-em up, but keep records. This way they can sort out if an ammunition manufacturer or 're-manufacturer' is cheating and selling the OEM stuff on the side.
I know Hornady went after a couple of USA companies for this problem, as it turns out the companies in question had been duped by a fake 06-FFL holder and the companies were not held responsible - thus I won't publicly name them.
Always assume thet stuff found at the range are reloads.
They aren't always, but that's the safe way. Just examine the cases. If they are good, use 'em, if not, chuck 'em. They didn't cost you anything.