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We've been shooting 4227 in the 300 and the 510 for a while and it seems to work just fine. I've not seen any problems with unburnt powder in either round and velocity has been pretty consistant. We haven't done any benchrest type accuracy testing though so I can't say anything other than it seems good enough to nail the target. I don't shoot AR's either so no idea what it will do out of them. It works fine in the SIG 552-300 though with a 9 inch barrel.
Frank
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