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Many use extruded or "stick" powders and it is true that volumetric metering is standard.
The factories have several "qualfied" powders for almost every load and their choice is often based on economics. Their primary goal is to make pressure, velocity and (sometimes) accuracy standards they have established at the lowest cost. While you and I think nothing about a powder that needs a few tenths of a grain more than another when you think it terms of tens of thousands of rounds that few tenths adds up to real money.
Only ATK (Federal and CCI/Speer) actually owns a powder manufacturing facility (Alliant) so they buy on the open market from both domestic and overseas sources. As long as the powder meets the requirement price rules.
I think it is true that we are seeing more ball type powders because the manufacturing has really improved and they can be much more versatile.
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