I just googled "Winchester Ranger Ammo for sale" and was able to find multiple well-known online ammo retailers offering it for sale to civilians.
It's marketing. If an ammo maker wanted to restrict it's wares to certain markets, it would do so. NOBODY would be able to sell it, especially not high-profile outfits like Ammoman, etc.
Also, just because an item is marked "Law Enforcement Only" or something similar doesn't mean it carries any weight. A number of my friends have Glocks that have "Property of Monroe PD" engraved on the slide. They used to be police property, but were liquidated and resold. Totally legal to own.
Long story short, you're good to go.