That’s the whole point of free enterprise, the idea that you can sell (or not sell) what you want within the limits of the law. Gun owners (like myself) will still be able to buy handgun ammo, just not at Walmart. Personally I prefer to purchase ammo at gun stores or my range “pro shop”, as they are more likely to know the product than a retail store clerk. Besides, it helps the small gun stores by reducing competition from a “big box” store.