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So what if I want to make a real powder puff .38 load for my wife. If I use VV N310 (VERY fast) and a 125 grain bullet, would I be OK despite the fact that the case will not be full?
Also, do full cases generally burn the cleanest?
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Very fast powders due not suffer from this problem, whether it be real or imagined it is only a problem with slow(er) powders. I have used small charges of Unique in my rifle cartridges to fireform the cases to the chamber. They were only about 35% full.
The very fast powders burn so fast that in many instances the powder is completely burned before the bullet has moved even an inch, sometimes before it moves at all.
Case "fullness" doesn't determine clean burning. That is a property of the powder itself and also influenced by the peak pressure reached. Generally, if your load produces a pressure that is in the range of the powders design then it's going to burn as cleanly as that powder will burn, slightly more so as pressure increases, generally.