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According to an article published in "American Rifleman" in roughly 1984, Winchester primers all contain an aluminum oxide fuel element specifically added to facilitate ignition of their ball powders. I use a LOT of WW-296 in both 357 and 44 Magnum applications, and the Winchester LP and CCI 350 primers both produce very consistent results--small velocity SD's, superb accuracy, and high velocities with safe and sane pressures. I cannot discern a significant difference in heat range between the two primers, but your mileage may vary. BTW--my first post here, and this looks like a real nice place to learn something!
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