I've shot alot of the Greek HXP in 303 British caliber and that is non-corrosive. Excellent boxer primed brass too for reloading. Great ammo,,too bad the supply of 303 dried up.
Lake City Arsenal switched over to non-corrosive priming in 1951/1952 (ball/AP)...or '52/'53 depending on which list you read from
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Never had any HXP in 30-06 so I personally can't say for sure that it's also non corrosive.
However on every M1 forum that I've read I can't think of any comments other than the HXP being non-corrosive.
Most folks are buying it from the CMP now.
I'm still whittling down my pile of Korean stuff...