Leftoverdj.
I don`t believe I wrote, that I did any tests.
What I wrote was. From, experience and reading.Here is my Trot.
Some such reading comes from Speer Reloading Manual #11 page 33 LOT UNIFORMITY
“ Quote” Powder manufactures strive to maintain a high degree of uniformity between lots of powder sold under the same label. This effort has been quite successful for many years, but recently, some wide lot-to-lot variations have found in Factory-Fresh (That Sir is my reply to your question of what is Fresh and not surplus and why David Tubb, one of the most renowned rifle shooters in history, buys enough powder of the same lot # to last the shooting season.) canister powders. These are popular powders that are widely used by hand loaders. It will be noted that specific recommendations in the charge tables are often at considerable variation with earlier Speer data, and some data from other sources. These revisions were made necessary by unexpected variation in burning characteristics in lots of the same powder.
From. Hornaday, Vol 1 Fifth Edition page 38.
“Quote” The table of relative burning rates we present here is informational rather than prescriptive; It is definitely not a powder substitution chart. Not only do powders vary from lot to lot and year to year of manufacture, their relative burning rates may very from cartridge to cartridge.
“Quote” From the above Speer manual pg 32.
STORAGE.
Proper storage of powders requires that they be kept in a dry place with even, cool temperature. They should be kept in the original factory containers. Glass makes a poor powder container. Light, like elevated temperature, accelerates decomposition of smokeless powder. Stored under proper conditions, shelf life of modern smokeless powder is practically indefinite. But if exposed to heat and/ or light, it may last only a few months.
How old is surplus? I suppose it can be from a recent factory overrun, but if it was recent 2-3 years. The factory sure needs some management help, and since it can be kept indefinite under the right conditions why would they sell it as surplus? It must have been a monster overrun.
It could have been a large batch they had stored for the use in military weapons. The bullet manufactures produce large amounts of ammo fully loaded cartridges that the military stores for future use. Within a certain time limit the military sell it. And that is what I buy to shoot as it has been stored properly “mostly” with the primer pockets sealed and no light can get to the powder. Some of this is well over 20 yrs old. Why do they sell it? If it not reliable enough for our military. Why would I want to use it for compition,hunting or self-defense. Nor would I use surplus powder either.
I really don`t care what you shoot, that is your choice, not mine. I was trying to pass on what I know; to people that may care about what they shoot. It maybe that someone here would like to compete agents David Tubb a National NRA Highpower Champion 6-7 + times. With your attitude I can tell you will never be that person, shooting surplus powder. Plink away, and let professionals write the reloading manuals and win National Champion Matches.
I have already given you my experience. I hope your surplus powder was cared for properly.