Has anyone ever experienced firing a double charge?

[schmeky]

zxcvbob,

Yes, in fact the next edition of the Speer reloading I bought a few years later listed a 10.0 gn charge of Bullseye for Ruger and T.C. Contender only.

As someone said, I was expecting a "pop", got a "BIG BANG" instead. Taught me a good lesson.

 

[WayneConrad]

As with JFettig, No double-charge, but an overpressure round from bullet setback. This was the even that taught me that SKS ammo must be crimped to the cannelure, due to the steep feed ramp. This thread has a picture of the case showing the bright ring from the incipient head separation. The case grew 0.021". No damage to me or the rifle.

In another incident, with a different SKS, a suspected double or overcharge, but it was a factory load, not a hand-load. Blew out the primer. The hot gases blew the firing pin out of the back of the bolt, causing the firing pin to bend so that it could clear the firing pin stop pin. No other damage to the rifle. No injury to the shooter, as the receiver cover stopped the firing pin in its tracks.