I'm inclined to second JHC's advice about mags. My SA Mil Spec has as much love for hollow points as it does for ball, and has a certain affinity for Hornady TAP. I've used CMC Powermags almost exclusively, though. If it persists across different ammo and mags, I suggest making good on the outstanding Springfield Armory customer service. 
-B
RIP, Jeff Dorr: 1964 - July 17, 2009
"When young men seek to be like you, when lazy men resent you, when powerful men look over their shoulder at you, when cowardly men plot behind your back, when corrupt men wish you were gone and evil men want you dead . . . Only then will you have done your share." - Phil Messina
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