Ditch the magnum primers.
Load OAL just kissing the lands.
Load three rounds at 41.5gr and go up 0.3gr until you get to 43.5ish.
Shoot an OCW.
Pick the OCW, and load up various OALs from 0.010 jam to 0.040" jump in 0.010 increments.
Pick the best couple OALs, load 10 each, shoot to verify, then load up a BUNCH.
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