I came across a few myself a while back. They are apparently early Win Clean brass. I think the newer stuff is small primer. I came across a few rounds of this also.
From what I was told on a different Forum, apparently no problem reloading the large flash hole brass. I myself would use it for standard pressure practice ammo, if I were going to use it. With that said, I still pitched the cases I came across.
I guess I may need to start sorting out small primer 45 brass also.