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Posted: 10/30/2015 8:02:00 PM EDT
I want to use Alliant Power Pro 300 MP powder for some .357 magnum loads but there is very limited info yet on this product for reload charges. Specifically I want to load 158 grain gas check  LSWC and Sierra 180 grain FPJ for .357 magnum. Any links or personal experience with this powder for reloads would be great . . . been searching hours on WWW with no luck yet. Will be using these rounds in a carbine and a Super Blackhawk.
Link Posted: 11/1/2015 8:56:49 AM EDT
Alliant shows some data, but not much. Maybe start 10% lower than the listed loads and work up from there, but I would keep looking for others as well.

Here

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