Took some rough measurements on one of my 300winmag mod 111 actions.
Ejection port = 3.75"ish
Factory magazine = 3.495" max coal, max 3 crtgs.
Bottom action opening = 3.75"ish
If you get a AICS compatible bottom metal and aics 300winmag mags, The max coal should increase a little. But can't say how much since i don't have one.
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