The Firing Line Forums - View Single Post - Fuller’s Earth, Secondary Explosive Effect, and How Time Flies

Brian Pfleuger · November 20, 2012, 03:42 PM

I've heard that theory too, it's why it's typically recommended to not use loads of slow powders less than around 65%.

The trouble with detecting early warning signs and or pressure events that don't cause complete failures, I think, is the time scale of these events.

A "normal" pressure rise is in the neighborhood of .00025 seconds. A pressure event that burns all that powder fast enough to create the pressure which would be needed to blow up a gun, pressures that are 2x normal max and something like 4 or 5x the indicated pressure of these loads, might take like .00005 seconds or something.

Maybe detectable with the right equipment but probably not in the $400 price range of RSI Pressure Trace and similar consumer level equipment.

November 20, 2012, 03:42 PM	#24
Brian Pfleuger Moderator Emeritus Join Date: June 25, 2008 Location: Austin, CO Posts: 19,578	I've heard that theory too, it's why it's typically recommended to not use loads of slow powders less than around 65%. The trouble with detecting early warning signs and or pressure events that don't cause complete failures, I think, is the time scale of these events. A "normal" pressure rise is in the neighborhood of .00025 seconds. A pressure event that burns all that powder fast enough to create the pressure which would be needed to blow up a gun, pressures that are 2x normal max and something like 4 or 5x the indicated pressure of these loads, might take like .00005 seconds or something. Maybe detectable with the right equipment but probably not in the $400 price range of RSI Pressure Trace and similar consumer level equipment. __________________ Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley