WST. Burns clean, bulky enough, goes through the powder measure smoothly, readily available.
If you are wanting top velocity, it is not the powder to use but that is no particular hindrance to me since I rely on the factory for that level of performance in .40 S&W.
Midway recently had Rainier 165 grain HP's on sale and I scarfed a pile of them, so will be working up a load for them soon.
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