By sure it's a Herter's before you fire it.
BLUE BULLETS ARE USED IN PROOF LOADS.
Unless you have positive ID, don't risk that it might be a "blue pill." An ultra high pressure proof load.
I didn't fight to defend your freedom so you could vote to take away mine.
"A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
John Stuart Mill."