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T. O'Heir · February 12, 2020, 02:14 PM

"...targets actually make a "gong" sound..." Likely has to do with how hard and thick the steel is. Like Aguila says, the temper matters too. Bells can give a different sound according to their material and thickness.
I believe, mostly a WHAG, the 'gong' noise is caused by how the metal vibrates. If the plates are connected to a bar so they can be rest remotely, they'll vibrate differently than one hanging on a chain.
What type of bullet matters too. A cast handgun bullet splats to flat vs bouncing. Whereas a jacketed bullet will usually be deformed and bounce. Different sound.
"...armor of an Army personnel carrier..." Lotta those are not steel. They're Al. M113's and LAV's have more Al armour than steel. LAV's are built on the other side of London. I had an occasion to be in the plant a few years back. Actually helped assemble 'em.

February 12, 2020, 02:14 PM	#11
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	"...targets actually make a "gong" sound..." Likely has to do with how hard and thick the steel is. Like Aguila says, the temper matters too. Bells can give a different sound according to their material and thickness. I believe, mostly a WHAG, the 'gong' noise is caused by how the metal vibrates. If the plates are connected to a bar so they can be rest remotely, they'll vibrate differently than one hanging on a chain. What type of bullet matters too. A cast handgun bullet splats to flat vs bouncing. Whereas a jacketed bullet will usually be deformed and bounce. Different sound. "...armor of an Army personnel carrier..." Lotta those are not steel. They're Al. M113's and LAV's have more Al armour than steel. LAV's are built on the other side of London. I had an occasion to be in the plant a few years back. Actually helped assemble 'em. __________________ Spelling and grammar count!