So, I posted this because of a recent discussion on another forum. I commented I had some older canisters of Reloder 7 (Hercules) recently, but am using from a more recent lot (Alliant) that's less than 10 years old. Someone posted to be sure to work up new loads if/when I start using the older powder, they also commented there is differing amounts of nitroglycerin and there would be Brown markers. So I open a old can of Hercules, sure enough brown markers.
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Well, it appears that was just a happy coincidence. Because after the differences of opinion in this thread, I did some searching and found a interesting thread. It seems that Hercules would "adjust" Lot to Lot of Reloder 7 and then add various colored markers to reflect what they did. I guess it's even documented in some Lyman reloading manuals.
https://castboolits.gunloads.com/sho...655-Reloader-7