Microgroove Marlin loads worked up from Hornady #4. I ran 56.0 gr. 3031 with Rem. 300 gr. HP W-W Brass and CCI 200 primer. Still had room to go pressure wise, showed good offhand accuracy at 200 yards and I still could boost the charge if I so desired. You'll find that the different manuals can have some substantial variations in what they call max. charge.
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