Sounds like your not up to temp with it just yet.
If you do the preheat on the stove, set a iron skillet, or old skill saw blade on top of the burner to equalize the heat, and keep it from being directly on the aluminum mold. IF you heat it straight up you could possibly and easily war the aluminum.
If your using the 6 cavity old, just start out with the first two holes and pour as fast as you can to get the heat up. Once you start throwing a good bullet from those add another hole. Repeat until your pouring all six cavities.
The big bullet molds like heat, and they can cool off pretty quick as well. I use several in the 300gr range. I try and keep my pot temp in the 650 - 675 degree range, and pour fast enough to just get a light frosting on the bullets. So far it has worked great and it helps keep the tumble lube on them as well. (Thats my story and I'm stickin to it anyway)
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