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And if you want to run heavy for cal the slower powders yield greater velocity.

I load 100g in dad's 18.5" mod 7 using imr7828ssc. Works a treat and gets 300 fps more than 100g federal.

I load 100gr SGK in front of IMR7828ssc in my fathers 18.5 inch model 7, doing just shy of 2900. The heavier pill holds a bit more energy as the range gets out.