Hi Allen,
There are a handful of good powders out there, I am not sure about 20/28 in a 410.
I have used H-110 in the past and Alliant 410(which I am using now and like). Lil Gun is also another powder, but I have not used it.
Most places stocked Alliant 410 during COVID so I built up my loads from using that powder. I like it and recommend it...
Edit: Great minds think alike Ken...we must have been typing at the same time
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