Jerry,
When you think of low pressure loads, you're probably thinking in the 5,000 to 7500 psi range. I believe that is correct for 10 and 12 gauges. For the smaller guages, the low pressure ranges will be higher than those numbers although I don't know what they are. Also the powders you have listed may be fine for low pressure 12 ga loads, in 20 gauge, they may very well be different. You may also want to look at different hulls such as Federals because the internal shape of the hull and basewad material have a direct effect on pressures everything else being the same.
Sorry, but I don't have any more of an answer for you, maybe someone who has more info can enlighten both of us as I need some loads too.
Jack Kuzepski
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