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Old 07-09-2009, 04:34 PM
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Default 55 grain .223



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Why do these pack such a wallop? .22 lr are 40 grain. 9 mm are over a hundred. Just seems they would be a lot more
Old 07-09-2009, 04:42 PM
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55 grain refers to the bullet weight, not the amount of powder used.
Old 07-09-2009, 04:52 PM
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3200+ feet per second
Old 07-09-2009, 04:53 PM
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Yup Ecilop is right.

And then it's important to realise that the 40 grains .22 travels at speeds somewhere between 300 and 400 meter per second. The 55 grains .223 travels at speeds between 900 and 1000 meter per second, and closer to the latest one. That's why it packs a good punch.

Edit: xm was faster then me, what he says ^^
Old 07-09-2009, 04:56 PM
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energy at muzzle 55 grain vs 9m 115 1400 vs 300 foot pound respectivly there abouts
Old 07-09-2009, 05:03 PM
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114 gr 9mm energy = 570 joule
55 gr .223 energy = 1738 joule

From wiki


Energy is calculated by:

Energy (joules) = ˝ x bullet weight (kilogram) xspeed˛ (meter/second)

The speed is squared to calculate the energy, so if the speed is doubled, the energy is four times bigger.
Old 07-09-2009, 10:11 PM
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Pack such a wallop?
Serious?
Old 07-09-2009, 10:33 PM
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The 55 grain .223/5.56 bullet is kind of wimpy for combat. What makes it work is the tactics that people use to employ it. If I have one of those rifles in that caliber, I know, from experience, that if a bad guy gets close enough to me, say under 100 meters, I automatically go to head shots. Another thing that makes the 55 grain bullet work is lots and lots of hits. Repeated hits to the sternum will eventually make the .223 caliber rounds effective. So if I am attacked, I either bang away at the center of the chest or try to hit the bad guy in the head as soon as I can. But more often than not, I just automatically Mozambique the bad guy with 2 shots to the chest one 1 to his head. 2 + 1 works well for just about any caliber of firearm.
Old 07-09-2009, 10:42 PM
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55 gr is ok, but I prefer the 62gr fmj or penetrator in my 14.5 in and 16 in barrels respectively. I save the 55's for the 20 incher. I would use a nice 77 gr but they are getting to far out of my price range and I'm saving those for serious butt whuppin combat with the zombies.
Old 07-09-2009, 10:45 PM
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wimpy wimpy.......designed to wound not kill. 7.62 designed to kill.

It takes more people and effort to take care of a wounded person than a dead one. Wounded soldiers tie up the battle field.
Old 07-09-2009, 10:54 PM
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Must have never seen the REAL life effects of a tumbling, fragmenting round like the 5.56 mm. Trust me, I have, on more than 1 occasion.
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Old 07-10-2009, 01:36 AM
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thanks for clearing up this misconception.

How are powder charges gauged? Powder charge would seem to be a better measure of force. I would much rather have a .50 cal,600+ grain thrown at me than shot with a .22.

wimpy? ok. I wouldn't want to be on the wrong end of one nonetheless.
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Old 07-10-2009, 02:14 AM
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.223 (5.56) yaws and framents on impact, creating headaches for field surgeons the world over. Also a very fast round.
But there were some problems from the green tips in the mid '90s if I remember correctly. Over penetration, just like the 7.62X39.
Old 07-10-2009, 06:26 AM
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Quote:
3200+ feet per second

Thats exactly why!!! Light weight fast bullet equals tremendous shock and tissue damge. This little bullet also has the propensity to deform to a banna shape if it doesnt break into two causing boths pieces to tumble in different directions after creating a wound cavity all out of proportion to its projective size. This bullet has about 500 ft lbs of energy at 300 yards out of a 20 inch barrel which is equal to a 357 125 gr HP at the pistols muzzle and its all dumped on the target as this little bullet rarely leaves a target when hitting at high speed. Its a devastating little combo in the 223 on soft targets unfortunately near worthless on targets behind cover as the bullet will often "blow up" at such high speed when striking a solid object.
Old 07-10-2009, 07:20 AM
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It only does the yaw/fragment thing out to about 250 yards. Past that,as it loses velocity,it stays together and does less and less as the range increases.
Shooting it out of short barreled carbines doesn't help.
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Old 07-10-2009, 07:22 AM
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Quote:
Originally Posted by Dr.Gee View Post
Why do these pack such a wallop? .22 lr are 40 grain. 9 mm are over a hundred. Just seems they would be a lot more
55 grain .223 tumble and do funny things when they hit targets.One i was firing .223 cheap stuff 55 grain from Malaysia and when i looked at the target the hole was the shape of a bullet pretty cool.62 grain tend to tumble less but with that scant amount of weight it still does funny things when it hits a target.
Old 07-10-2009, 11:42 AM
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Must have never seen the REAL life effects of a tumbling, fragmenting round like the 5.56 mm. Trust me, I have, on more than 1 occasion.

So have I. I was around when the .223/5.56 first got introduced into Viet Nam. Yes, it will kill and wound BUT it is nowhere near as effective bullet-for-bullet as a decent 7.62 is. They took a varmint round, a round used on small rodents, and tried to convince American soldiers that it would work on communist soldiers. What the designers forgot was that in many cultures our forces go up against people who are doped up to the max BEFORE going into combat against us. So there you facing off against some doped up lowlife and somebody wants you to use a teeny, tiny bullet to stop him???? Get real. Even at 3,000 feet per second you need something more effective than a lightweight 55 grain piece of metal. Same thing for pistol ammo. Lightweight bullets for survival situations are not the best UNLESS you have adapted your TACTICS to make the light rounds work.

So there you are in a survival situation. A gang of doped up scumbags are headed right for you like an upcoming thunderstorm. Do you REALLY want to trust your life or the lives of your family to a 55 grain bullet or would you rather have something like a 122 grain bullet out of an AK type rifle or would you rather have a 164 grain bullet fired from an M1A? Your call. Can I make an M-4 carbine work for me? Sure can! But I guarantee you that I will NOT be using 10 to 20 rounds into each bad guy to stop them. I will, however, be doing a Mozambique shooting technique at close range and, when possible, head shots with a scoped rifle as needed to stop anything under 100 yards or so. But given a choice, I will always opt for the larger, heavier or beefier bullets over any .223/5.56 round.
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Old 07-10-2009, 07:56 PM
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jungle crawler thats because the green tips are m855 penetraters aka as armor peircing.
Old 07-10-2009, 08:07 PM
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herd sniper i wont argue the point of which one is better. that most always causes fights on here and i'm really sick and tired of reading how if your not agreeing with the other party then you dont know a dang thing. this is why i say it's what the other party is comfortable with. i just hate it when folks think that the 5.56mm is a non lethal round. every round is non lethal if your not proficient with it.
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Old 07-10-2009, 08:45 PM
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Wow, you guys went off the deep end with this:

1/2 MV(squared) = KE (Kinetic Energy)

One half Mass times Velocity squared equals Kinetic Energy.

Considering that a 40 grain .22 rimfire cartridge travels at about 1280± fps and a 55 grain centerfire .223 round travels at 3200± fps, you can easily see without even doing the math that the .223 centerfire round will have far superior Kinetic Energy than the .22 rimfire round.

In layman's terms, a 400 lb crotch rocket going 55 mph will do far less damage than a 600 lb Harley traveling at 140 mph when they hit a solid wall.

You guys can now go back to all of that yaw, temp cavity, fragmentation BS you were haggling about.
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