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The 5.56 is an incredibly powerful cartridge?You have got to be kidding!
I will also divulge the fact that I believe Adam Lanza was set up like a bowling pin
originally posted by: squittles
a reply to: Sunwolf
The 5.56 is an incredibly powerful cartridge?You have got to be kidding!
Well, compared to any handgun, it is, with roughly twice the energy of a .44 magnum round at zero distance. But itself less than half the energy of your .30-06, and a third the energy of, say, a .338 Lapua. What the heck, here's the stats:
.44 magnum, 240 gr 741 ft-lbs
.223, 62 gr 1322 ft-lbs
.30-06, 147 gr 2974 ft-lbs
.338 lapua, 300 gr 4673 ft-lbs
Then again, you're not going to be firing a .30-06 or a .338 from a 30-round clip. In my own experience, my opinion is the lightweight .223 is pretty easily deflected as compared to a heavier round - whether by glass, grass, drywall or wind, over distance. But it's a very lethal round in its engagement envelope, due to its high velocity and tendency to yaw after impact.
Anyway, to the OP's original question, there are differing types of safety glass - this was likely tempered safety glass - "tempered" to resist breakage, but what makes it "safety glass" is it's *designed* to, when broken, shatter into those characteristic cubes/granules, as opposed to, say, those long and lethal shards regular glass breaks into.
Basically, it resists breakage, but once the glass is broken, it shatters into relatively harmless small fragments - so the pictured window class could easily have been a single .223 (or two) - no breaching round necessary to cause the damage in that photo.
The other types of "safety" glass would have proven to be more an obstacle:
-- laminated safety glass, with an interlayer of plastic to which two (or more) glass sheets are bonded to, (like an auto windshield) would yield to a bullet, but the breach would be relatively contained, as the plastic sheet would still be there, holding the rest of the pane together.
-- wired glass, which you used to see in schools, but not so much these days, as it's not really all that "safe" compared to tempered safety glass.
originally posted by: Snarl
originally posted by: Sunwolf
originally posted by: Snarl
No telling. The 5.56 is an incredibly powerful cartridge even if the bullet weight isn't much to speak of. I would expect someone considered the fragmentation effects ... but maybe the entry location just didn't get as much attention as the main event.
Did you notice the label below the hole in the magazine rack? Was that finger-print powder applied by an over zealous detective during the forensic examination (remember it's been labeled)?
The 5.56 is an incredibly powerful cartridge?You have got to be kidding!Strange as how I can`t get the 5.56 to penetrate auto windshield reliably,yet a 30-06 will go through the glass through the entire interior and through the gas tank and into the ground.Incredibly powerful?Geez!
I'd be amazed if you were firing a 55 gr bullet from a 30-06 cartridge. LOL