rbuck351,
This thread if you go back and read the OPs first request is not about kicker loads. Nor is it about duplexing powder to gain some kind of majical velocity. It is about using powder that burns slightly faster than Kingsford charcoal as a filler instead of an inert substance that sometimes brings its own problems. For example my 257 AI performs wonderfully with condom bullets but it's case capacity sometimes is problematic with cast. The sharp shoulder makes inert fillers problematic also. So a filler that burns with the load charge but at a rate that adds little or no pressure to the curve may be a good thing. This conversation is about that. Or at least it started out that way. It is also a subject that I have wondered about for a long time and would like to see some serious discussion about how to go about it. Not spend time reading about how I shouldn't do it with no more to show than there is no published information about it. Or do this instead. If there were published information about it we wouldn't need to discuss it now would we. If you don't mind I would like to get on with discussing the subject matter at hand.