I have been casting and shooting lead boolits for several years (Mebbe 14-16), and have always used load data from a Lyman Manual and have worked up clean loads (using mostly fit and alloy hardness), usually with a specific cartridge, one at a time. I recently bought some powder and as I was re-checking load data I realized I have not researched "optimum powder burn speed" for cast boolits, if such a theory exists. So, which is better for cast boolits, fast powder for caliber or slow for caliber? (like is W231 better for cast bullets in .44 Magnum than 2400?). Velocities, charge volume, etc., aside, just burn speed...
Thanks