I've completed a new batch of research on muzzleflash of personal-defense loads for the 357SIG. It confirmed last year's research and produced a pleasant surprise that's almost useful for 357SIG reloadists, that being Vihtavouri N105. Details are at http://jeffreybehr.zenfolio.com/p626353596 Here are a couple teases. About the worst powder I tested, Longshot. About the best, Accurate #7.