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Help identify old powder from a barrel.

I bought a large plastic cat litter bottle full of about 12 or 14 pounds of an unknown gun powder. This was about 20 years ago and it came from the estate of an old shooter. From the other things in his estate apparently he was into Trap and/or Skeet and duck hunting. Now it is finally time to figure it out. It is marked Herco and is a small perforated black disc flake the same diameter and thickness as Herco. It has a shine where my Herco has no gloss and of course Herco is not perforated. It has no colored dot tags, nothing but little black discs. My Herco is about 25 years old but this powder seems to be closer to 70 years old. Still smells correct.
The story was that it came in a large barrel and this gentleman had put it into smaller containers he could handle as the barrel was impossible to deal with by himself. Obviously it would seem likely to be a canister grade powder and possibly military surplus. Have been reloading since the 1970s and used my share of canister grade surplus powder. Not afraid of canister grade but know to be extra careful when fooling around with it without knowing more about it.
Perhaps it really is just regular old Herco.
My memory is about shot but seem to remember some popular canister powder several vendors were selling in the 1950s to the '70s that carried the advice "loads like Herco".
Back then almost everything I shot was named Magnum so I never paid any attention to powders like Herco.
With the shortages that $5 cat litter jug is starting to generate some interest.

I realize that many replies will be something to the effect that I am stupid for buying it and the sun will collide with the moon or worse if I try to use it. :) Let it be known, I don't care about all that and only wish to identify the powder.
Thank You
 
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What I would do...

use a suitable pistol like a 357 TC Encore...

load 5-10 rounds of your Herco and a like number of the old powder using the exact same other components. Choose a starting load of modern Herco for a normal weight bullet.

shoot 5 rounds of known Herco over a chronograph. Then shoot ONE round from the unknown powder with a sandbag draped over the breech. Record the velocity. Then examine the pressure signs. If everything looks O.K. And the velocity is close, Then load a ladder with each powder, known and unknown and see if the velocities track. If the original round has a different velocity (15%) then start again with a different known powder and try again.
 
What if it is bulk military Bullseye?
If one was to load believing it is Herco, it could be disaster-est.

Please work up a load cautiously.
 
Not afraid of canister grade but know to be extra careful when fooling around with it without knowing more about it.
This is simple. There is NO fooling around with it at all. The only thing you should be trying to figure out is whether it is a suitable fertilizer.
Maybe I'm overly cautious (and I'm quite familiar with maxillofacial surgery) I only use powder that I bought and I opened.
 
If it is perforated, it sounds more likely to be equivalent to Clays or thereabouts.
Whatever Hercules called Clays it may be Herco afterall
I have all the ADI (Hodgdon) made shotgun/pistol powders here, some are perforated and have red/green/yellow markers and some are graphite colour with and without perforations.
Without a picture, even a guess may be miles off.

Cheers.
 
If it is a faster pistol powder 12 or 14 pounds will go a long way. Bullseye is my favorite powder for 38 special and 45ACP. I admit it is dirty but the residue cleans off very easy and it is not position sensitive at all which is important for my very light target loads.
Still hoping someone remembers their old bulk powders or better yet some old reloading books that cover them.
 
I think a rifle woman is right on as usual, but maybe a step further would be to call and talk to the people at Aliant powder. Explain the the shortage has made this a must do and see if they can give you a way to test or if they will test it for you. They may be able to look at the powder under a microscope and tell from the extrusion what it is. Ive been loading from a container of Unique that has a hand written date on it from 1967. I certainly would not worry about the age. During one of the Obama shortages I was looking for small pistol primers. At the West Palm beach gun show I found a guy that had some, he was selling off stock from a gun and pawn shop the ATF shut down. He had 2 boxes of SPPs on the table and said $50. The boxes looked beat up. i told mine OK and asked if $50 was for both boxes. He said no it was for all of them ,he gave me 17 thousand primers. When I got home they were damp , not soaked but they hat moisture on them. I looked on the internet and found that the manufacturers of primer had changed many years ago to a compound that wasn't effected by water. I found a guy on BR central that had done some testing and soaked 10 primed cases in water for a month and 10 primed cases sat in the window sill for the same month. After dried and left for another 10 days he loaded them all and fired through a coronagraph. Less than 10 fps spread. I dried all the primers and packaging in my dehumidifier and have not had a FTF with them yet. Components are a lot tougher than most think. Proceed with caution, do some research and ask Aliant.
 
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Find the smallest load of the fastest similar powder, use a stout well made gun (TC) and do as RWoman said...use a chrono, watch for issues. Realize it could be 800 x or similar
 
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What if it is bulk military Bullseye?
If one was to load believing it is Herco, it could be disaster-est.

Please work up a load cautiously.
The max load for a 357 and a 158 Gr LSWC and Herco is 7.9 grains. A starting load would be 6.3 to 6.5. The max load for Bullseye is 6.5. So the velocities will be different 1300 vs 1400. But the pressures are ok.

the method I described is what I used to confirm that some re-packaged powder I was given was unique. I used 38 special and cast 158 bulkets. Velocities were identical. So I’m confident that the repacked powder is Unique for practical purposes.
 
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Don’t forget that Hercules powders that are older than 30 years were made in a totally different plant (Kenvil NJ) than where they are made today. So while they may have the same burning characteristics, there is a good likelihood that they won’t look the same.
 
The Hercules Herco in the right sample came from a red, green, orange and silver cardboard can. The lot number is illegible but I see a revision date of 4/90 for the label.
 

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