Why the original container
On this page11
The instruction
Every powder manufacturer says the same thing: keep smokeless powder in its original container, with its original label, and do not transfer it to anything else.
The reason given is confinement
The factory container is described as built to give way rather than to hold, so that if the contents ignite the material burns and vents rather than being contained.
And a strong sealed container does the opposite
Which is the stated concern with a glass jar, a metal tin or a sealed plastic tub: they are designed to hold pressure, and holding pressure is the thing you do not want here.
This property states that as their reason
Not as a finding of ours. We have not independently verified the mechanism, there is no regulation to quote because the material is exempt, and a container catalog asserting combustion physics would be out of its depth.
Which does not weaken the advice
The instruction is universal across the industry and it costs nothing to follow. The original container is free and it is already correct.
The label is the second reason
Powders are not interchangeable. A load is developed for a specific powder and substituting another at the same charge weight is how people are hurt.
An unlabelled container of powder is scrap
Because nobody can identify it reliably, and guessing is the one thing that must not happen. Decanting is how containers become unlabelled.
Mixing is worse again
Two powders that look identical and burn completely differently, in one container, with no way to tell. Separate containers exist to prevent exactly this.
Our 210 jars are not for this
Clear, sealed, wide mouthed and exactly the wrong object. The same qualities that make them good for brass make them wrong for propellant.
So the honest page is a short one
Do not buy a container from us for smokeless powder. Keep the can, keep the label, and check your local fire code for quantities.