So far I have only used it seriously in 357 magnum rifles where it performs very well. I did try my rifle load (18.0 gr under a 158 gr FP/XTP) through a 3" and 4" 686. Averages were:
3" bbl: 1,102 fps SD=27 fps
4" bbl: 1,226 fps SD=33 fps
I've read a few article claiming that the Power Pro line, which includes 300-MP, has a flash suppressant but I've read other articles denying that. I tend to doubt that it is. There was some flame from the muzzle but not as bad as I remember 2400 to produce. However, on that day I did not have any 2400 reloads for a fair comparison.
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