New to the forum, so don't know what previous posts had to say about this, but it IS a pain when reloading brass scavenged from the range. I was surprised to see the Federal rounds put up with the small primers. I had seen Speer & Blazer headstamps having them & found out they were put up on their frangible & non-toxic ammo, as a previous poster noted.
One thing I did notice on the Speer & Blazer brass, and this is a concave look to the base. It really stands out when placed side by side along other brass, so this might help in identifying these from regular brass with large primers.