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Actually, when you consider temperatures only, all powders will burn at a temperature much hotter than necessary to melt lead.
But, as pointed out by sleeping dog, the flame contacts the bullet base for a very, very short time. If you recover fired lead bullets, you will note that the imperfections due to the sprue cut-off on the base are still very clear.
A candle flame is certainly hot enough to give your finger a wicked burn, yet you can wave it through the flame quickly with near-zero effect. You can do the same with a lead bullet and a propane torch (and if you must try this, please use pliers and not your fingers).
Leading is cause by friction ... and more pressure on the bullets base = more friction (all other things equal). If Titegroup were to provide a fast pressure spike, it may result in more leading. But I would expect all powders in its speed range to behave about the same.
I still believe that the major cause of leading when using target velocity loads is either an undersize or excessively hard bullet (or a combination).
dogfood
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