Load it into a gun and you didn't have a propellant — you had a pipe bomb.

That's not dramatic writing, that's accurate. Nitrocellulose had been sitting there since 1846 — nearly four decades — and nobody could make it behave. The gelatinization process Vieille worked out was the key that unlocked everything downstream, including whatever's sitting in your powder measure right now.

Vieille developed closed-bomb testing methods and formulated what became known as Vieille's Law — the mathematical relationship between burn rate and chamber pressure, expressed as r = kP^n.

This is the part that doesn't get enough credit. The powder was one thing. The analytical framework for predicting how a propellant would behave under pressure — that's what made it possible to engineer cartridges and actions systematically instead of just blowing things up and taking notes. Every burn rate chart in your reloading manual exists because someone built on this foundation.

Two French battleships — the Iéna in 1907 and the Liberté in 1911 — exploded in Toulon harbor, with heavy loss of life, with decomposing Poudre B identified as the probable cause in the Iéna's case.

This is the part that sticks with me. We talk a lot about old powder going bad — the "don't use surplus military powder" conversation at every gun shop counter — and here's the historical reason that concern exists. Degrading nitrocellulose doesn't just lose velocity. It gets dangerous. The diphenylamine stabilizer that solved this problem is still in modern single-base powders for the same reason.

For the handloaders here — have you ever had a powder you suspected had gone off, and what tipped you off?

Read the full article in The Handbook → | By The Boise Gun Club Team