Look into Unique and I think you may like what you find. It does very well for 38+P but in a 686 7 grains in a 357 magnum case under your 158 jhp may just be what you're looking for. Sort of a "magnum light". Not a lot of blast and flash but it should get around 1200 fps and shoots fairly clean too. I know a lot of folks don't like Unique but it really works well in a lot of different loads and in some calibers it's as good or better than some of the new whiz-bang powders IMHO.

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