I have started to have problems with my bullets keyholing. I thought some were slightly undersized because they sized easily. So I was drilling some holes through the base of the bullets to try and make the molds a little bigger when I noticed that I was hitting some voids. At least thats how it felt. So I filed a bullet in half and sure enough, small void near the middle. When I cast I seem to need to be at 800F to get good fill out on my Lyman 4 cavity 147gr 9mm molds. I cast using two at the same time. I think it may because I sometimes get a pretty slow pour from my Lee pot near the end. Sometimes I forget to open the adjuster on the valve a little more as the pot goes down as well. Both result in the occasional slow fill of the mold. Besides that these bullets look good. Any other ideas? This new batch is range scrap. Not WW.