I have had good results with R15 in most bullet weights but am curious about some of the newer powders in the 375. It would be a good thing to have better temperature stability although JB wrote that R15 was improved in this regard. I may be using old lots of it. R17 seems like a good choice and possibly R16, 4977, VV560, VV150 and others close to or slightly faster than the 4350s and possibly denser loading. I have not worked as much with the light bullets but am looking to get 2900+ fps with the Speer 235. I can do this with R15 but not with a lower pressure load.. I think JJ Hack has reported on using the 200 Raptor with good results. Any load information appreciated.

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