357 SIG is notorious for weak brass neck tension anyway. I always try to find something that will pretty much fill the case or be compressed. This will help prevent bullet setback if case tension is weak. Kind of like belt and suspenders thing. Jim Kirk has the rite idea. So is this the only propellant you have or something? The older AA reloading manuals have some info for using RedDot there but they have removed it as is peobably a poor choice.
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