if this were something like a factory reloader or smaller outfit like USA ammo or BVAC I would tell you to not worry about it but since it's one of the big 3(remington, winchester, ATK) I would heavily recommend calling and voicing a safety concern and getting the green light from them first. mixing primers is not common for major brands and I've even used that as a quick reference to tell whether something is a reload or what the head stamp says it is but making sure all the primers match.
for all you know this is the beginning of a safety recall because of some blunder at the factory.
all guns lost in a tragic smelting accident.
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