My dad has an original 18.5" barreled M7 in 243. I cronied the 100gr Fed blue box and it was 2600 fps, I got 100gr SGK handloads doing just shy of 2900 fps using 7828 ssc, but she was a flame thrower and pretty stiff recoil for my elderly dad, so I dropped back to 87gr with H414, and it's much better all round.
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