I use Hodgdon BLC-2 because it meters well and I can buy it in 8lb jugs. I've also used Winchester 748 for the same reasons. I only switched to BLC-2 because it was a bit cheaper per 8 lbs.
I've used the extruded powders from IMR, but it wasn't worth the hassle having to weigh each charge when the ball powders (BLC-2, W748) meter perfectly from my RCBS powder measure. If I saw a difference in group size I might would put up with the hand weighing, but I didn't.
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