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Originally Posted by Gamecock;135778429#3
There is more to worry about. Light loads can cause detination.
The theory is that powder level in the case is so low that when the
primer discharges, it blows over the powder charge and not through it,
leading to a radical pressure spike.
Therefore, I'd caution you to not load your .357 case at less
than 80% full, as you might do using .38 load data in a .357 case.
Joe
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I did a lot of reading on that subject when I started reloading. Everything I found indicates this is more a problem with slow rifle powders in underfilled bottleneck cartridges.
I suppose a seriously light load of 2400 might cause a problem, but why would anybody do that?