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Hutch has it right. Look at it this way......take a cast bullet of any alloy and shoot it without any lube. Presto instant barrel leading. Take the same alloy bullet and lube it with a quality lube and shoot it.......no leading. One of the old speer manuals (I think it was Speer) had a section on powder flame temperature. The core of the flame is extremely hot but the edges (that which touch the base of the bullet and the barrel is much cooler. One other thing ........if it was the heat that caused it then there would be leading with jacketed bullets that have an exposed lead base. This is not the case, so it can't be the flame temperature.
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