That's why I quit using double based powders years ago, for revolvers all I use anymore is H-110, 296 or Accuracy Arms #9 filled up to the base of the bullet or slightly compressed, double based powders are just too easy to double charge and sometimes hard to see the difference.
Wow. I'm actually impressed, simply because of how strong Rugers are built. That was one hell of a charge, to blow both the cylinder and top strap. My guess would be wrong powder.
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