Your brass is mixed headstamps. There are many possible variations. Since the brass is not homogenous, I do not think you will be able to reach a conclusion.
I suggest that you obtain better brass, all the same headstamp. Starline is very good and inexpensive. Lake City once fired is very good. I have 500 new LC, which are sometimes available from the LC operator.
Www.starlinebrass.com
Www.Gibrass.com