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Accurate 2520 is the perfect powder(meters like water too) for the M1A with 168 MatchKings. Fine tune the amount but most M1As end up shooting 43 to 45 grains.


When sizing your brass use a case length mic and only push the shoulder back .003. The M1A is hard enough on brass without oversizing. Even then throw brass away(crush it) after 5 firings. Any more and you are asking for head separations.


I fired about 6000 of that load and went from sharpshooter to master class with it.


Port pressure is mostly determined by how fast a powder is being used. A fast powder will have low port pressure, a slow powder high port pressure. Too low a pressure will cause unreliable functioning. Too high port pressure can bend operating rods and other nasty things.


[This message has been edited by Jack Roberts (edited 06-02-2001).]


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