So I am working up a new batch of .40 and I have a strange thing happening with my brass. My load is 180Gr Meister LRNFP sitting on top of 5.9 Gr of Power Pistol and CCI 500 primers. 5.9 is the starting load for a lead cast bullet according to Lyman. Well, I took out 3 batches, 5.9Gr., 6.1Gr, and 6.3 gr. I loaded up the 10 5.9 Gr. and shot them, but really didn't feel comfortable moving up, and in fact am considering moving DOWN. They had a heavy recoil and were considerably loud. Loudness is the norm for power pistol, but it was the brass that concerned me. The brass was discolored in a strange way I had not seen before. It looks as if, well if I had to describe it: You know when the Nickel plating wears off of cases you see the brass underneath? Well this looks like the exact opposite. The brass cases have silver spots/streaks running up from the case mouth about 1/3 of the case. It looks like brass is wearing off, but the cases are solid brass. Almost like it got too hot. Does anyone have any idea what I am talking about? Could those marks be coming from the lead bullets? Could it be a heat issue? Any insight?