I've never seen a powder with oddball shaped granules like that
I have. And it looks very similar to that.
Win Autocomp. And off the top of my head, those are both reasonable charge weights. Here's a pic I just took.
http://i688.photobucket.com/albums/vv241/gloob27x/SAM_0195.jpg
And here's a picture of the two, side by side. I corrected the scale so the rulers lined up, inch for inch. I guess you'll have to take my word for that.
http://i688.photobucket.com/albums/vv241/gloob27x/Temp2.jpg
Aside from the color/lighting/resolution issues, they look awfully similar to me. Note that my camera is adding a blue tint. The powder was photographed on a white piece of paper.
Hodgdon Reloading Center data for
Win AutoComp
147 gr parabellum: 3.6-4.0gr
230 gr 45ACP: 6.0-6.6gr
Looks eerily like hs-6, except for the tear shaped granules.
I've never seen HS-6, but per Hodgdon's data, those loads the OP listed would be awful light for HS-6.
It's definitely not HP38/Win231. HP38 is a lighter silver color and a lot more uniform, like flat perfectly circular discs.
OP, if you have one of these powders to compare to, I can tell you this. Win Autocomp has ~1.3x the density HP38, and about 1.55x the density of Unique.