Hercules Powder versus Alliant Powder - Differences?


NRA Endowment Member
Staff member
Forum Supporter
I ran across some old sealed cans of Unique, Bullseye, & Herco powder in 11 ounce tins. These have been kept in a climate controlled room.
My question is, should I be using the same reloading data currently published for Alliant's Bullseye, Unique and Herco for these 40-50 year old cans of Hercules Bullseye, Unique and Herco?
I would hope so, but any guidance would be appreciated.


uber n00b
Forum Supporter
2019 Supporter
i inherited a bunch of old powder imr4064,unique, and red dot i loaded up test rounds of each and compared to new stock i bought all was within 25fps of new vs old.Too bad we cant buy for the prices on these old cans lol