I respectfully question that statement. I have gotten many boxes of rifle cartridges from Hanson that had red primer sealant. I had believed that they were non-corrosive Boxer ammo. I have also bought several lots of surplus ammo from places like Cheaper Thank Dirt & Sportsman's Guide that had primer sealant on them & were sold as non-corrosive.
Can anyone else chime in with more information on this subject?