I have some old Winchester propellant that is probably about 17 to 12 years old, can not find the reciept to confirm. Has been stored in cool dry place, my air conditioned house. The metal cans are unopened and have seals in place under the caps. I would think it is fine, unless it deteriorates in the sealed cans as it ages.
Has the mixture of this powder changed over the years? I do have old reloading manuals 1981 and 1989 that give me information about loads.
Has the mixture of this powder changed over the years? I do have old reloading manuals 1981 and 1989 that give me information about loads.



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