[Unclenick]

Several folks have commented on finding factory ammo with crimped primers more recently. The reason the military started crimping them is the loose chambers in some machine guns coupled with increased pressure due to barrel heat would cause primer pockets to expand come loose from time to time and fall out of the case and into the mechanism. That would jam the gun. So, possibly the maker is figuring they'll be fired in a loose chambered semi-auto or one that heats up and raises pressure and they want to prevent that from popping the primers out.

I suppose it might also be that the new lot of brass is on the soft side and had the problem of primers pockets getting loose, so they decided to crimp it. If that's the issue you'll find out soon enough because it won't last many load cycles.