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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles. |
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What is more effective, 5.56 or .308?
Hey guys,
So I was cruising around arf com checking out the ammo oracle. It was basically saying that (out of a 20 inch barrel) m193 is more effective than expanding bullets. Basically the fragmentation has more DRT factor than expansion does. So, that explains for 5.56 fmj beating a .308 fmj within 200 yards... But how does the m193 stack up to a .308 expanding round INSIDE 200 YARDS? Is the 5.56 fragmentation still king, or does the extra power and diameter of the .308 give expansion the upper hand? I appreciate any comments, but I am really looking for some solid evidence. Last edited by nrakid88; 02-07-2010 at 9:58 PM.. |
#3
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Wait, what? Who said 5.56 of any type is superior to .308?
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Google Map of OLL Dealers List of CA-friendly Manufacturers, Dealers, Middlemen, and Magazine rebuild kit dealers Click me-->So you're a n00b and you want to build an AR? <--Click me This post is based on actual events. Some facts may be altered for dramatic purposes. All posts are pure opinion. All persons, living and dead, are purely coincidental, and should not be construed. |
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i cant speak from experience but i recall reading an article from an old SOF mag about a guy who unloaded his 20 rounds of 5.56 into a determined VC attacker and the adrenaline fueled Charles did not stop until his mate with an m14 put one into him. i suppose there is something to be said about "stopping power". even though your 45 auto will eventually kill a bear he will probably have had his way with you long before he dies.
i think it was from a rather critical article about the 5.56 basically likening it to a varmint gun unsuitable for use against people. maybe just propaganda? Last edited by Kerplow; 02-07-2010 at 10:14 PM.. |
#8
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Depends, if it came out of a 11.5 inch barrel with 5.5 inch flash hider, then yeah, it basically is a glorified .22. But if it was out of a 20 inch barrel then I would find that particularly hard to believe, and that operator error (putting rounds in places they won't matter) would be the more important factor.
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#10
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Remember, that one 18-20 year old kid got 13 .223 ballistic tip rds put in him and he was still going. Sometimes people just dont die fast.
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#11
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http://www.timawa.net/forum/index.php?topic=17111.0
careful with some of the pics , should not be viewed at work |
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It would be like a varmint grenade, for people.
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Hahahahaha. That just gave me a really interesting video idea. You know the slow-mo videos they make for the varmint grenades exploding on grapes and stuff like that? THIS video would be the same, but instead of grapes, its people exploding/rapidly expanding very slowly haha. We can get the test subjects from Chinese prisons
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#16
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Reminds me of the ploom of fur I saw in the distance after shooting at a rabbit about 150-200yds away with my ak-74. At that distance with the jack rabbits being so well camoflauged, the ploom of fur is the only way you know that you hit em.
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#17
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I could talk for days about this. A FMJ 5.56 round will definitely ruin someone's day. However, 5.56 FMJ is not very effective at immediate incapacitation when compared to other calibers. The 77gr mk 262 and Hornady 75gr rounds are considerably more effective, as are .223 soft point rounds. 5.56 m193 will be very effective if you use an original 20" 1/14" twist barrel because the round will not be well stablized and will tumble like crazy. That is why the 5.56 round was adopted. The problem was the lack of stablization totally screwed up long range accuracy. Changing the rifling twist to 1/7 or 1/9 fixed the long range accuracy problem, but made the round far less devastating in terms of terminal wound ballistics.
.308 on the other hand just flat out destroys the target. It is my choice. My favorite 5.56 m855 story was from a SAW gunner who was storming a house in Iraq. The soldier got separated from his men and was attacked by an enemy 10 feet away. The soldier shot the enemy 7 or 8 time center mass. The bad guy fell down, got back up, ran up the stairs and lobbed hand grenades down at the soldier for another 10 to 15 minutes before he died. |
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There is no solid answer to this question. For instance a fragmenting 5.56 FMJ or BTHP will do more damage than a non-fragmenting 7.62 NATO FMJ. Once you get a 7.62 NATO round that fragments then the 7.62 will win out. In essence it all depends on the bullet choice. I would suggest you look at this.
http://ammo.ar15.com/project/Self_De...rnadyRifle.htm The difference between a 5.56 75gr BTHP and a .308 155gr ballistic tip isnt all that huge but the .308 does win out and its by far the most devastating .308 bullet on soft tissue. |
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The OP is based on a pigeon-hole argument.
I know you know this... The solid answer here is data can be manipulated to fit any conclusion and it's far more complex than people try to nutshell. You have to be VERY specific about the conditions & loading when making a comparison. I will say this, 5.56 is underrated, especially with the most modern loadings. I don't think there are too many people who would argue that 5.56 is selected over .308 because of its efficacy. Quote:
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Google Map of OLL Dealers List of CA-friendly Manufacturers, Dealers, Middlemen, and Magazine rebuild kit dealers Click me-->So you're a n00b and you want to build an AR? <--Click me This post is based on actual events. Some facts may be altered for dramatic purposes. All posts are pure opinion. All persons, living and dead, are purely coincidental, and should not be construed. |
#20
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Like pinker said, with modern loadings 5.56 can hold its own against the .308. While the .308 offers improved terminal ballistics you pay for that increase in weight, recoil, muzzle flash ect. In the end, what you have to realize that killing bad guys is a system function that relies on training: tactics and marksmanship, weapon mechanics, optics and bullet lethality. |
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ya the 5.56 might win in extreme instances. but the majority of the time 308 is gonna be the best bet. if ur target has body armor, any kind of cover, or any kind of range. not to mention the 5.56 is made for the 20" barrel and everyone is moving to the shorter barrels
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Two more things you should know:
1. Temporary cavity means nothing. 2. Hydrostatic shock is not real. Bullets do funny things. Really funny things. Sometimes they create far more devistation than thought possible. Sometimes they do damn near nothing. When you are deciding on a bullet for a specific job it is best to not count on gimmicks that may or may not happen. Hollow points might not expand. Bullets might not fragment. In the end the only thing you can count on is the fact that the bigger and heavier a bullet is, and the faster it is going, the more damage it will probably do to the target. Even then, don't count on that. I like .45 and .308 because they rely the least on bullet magic to make them effective. Still, bullets are not a very efficient way to incapacitate a threat. Don't ever put that much faith into their performance. |
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My friends and I have quickly chopped down trees with .308, while those same trees simply laughed at all the .223 we threw at them. I'm not saying .223 isn't effective at stopping bad guys. I love some of those heavy 77gr and 75gr loads. I'm just saying it isn't wise to put too much weight behind jello. It's not the whole story. Not even close. |
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#26
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From what Ive seen, if the temporary cavity exceeds the dementions of a body/body part, there is serious devastation in the form of explosions and/or big tears. Did you see that guy who got shot in the thigh with the m193 from a few feet away? Allegedly the bullet didnt even strike the femur but it was destroyed. And the muscles and skin were torn in places not too close to the fragmentation. I cant say that this was the direct cause of the temporary cavity but I definitely wouldnt be surprised if that played a good part in the leg explosion.
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#27
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And yes even a bone as thick as the femur can be fractured by temporary cavitation of the bullet passes close enough to it but its still pretty rare http://www.ramcjournal.com/2001/woun...ct/clasper.pdf But generally most tissue is elastic enough not to be affected by temporary cavitation by itself. Last edited by J_Rock; 02-08-2010 at 12:16 PM.. |
#28
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The good news is that both of these are better than a pistol cartridge. There are pros and cons to each depending on the situation. I wouldn't feel underarmed with a 223. I think the most important criteria is good shot placement while people are shooting at you. FWIW, I'm sure these caliber discussions have been going on since firearms were invented.
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#29
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I've seen deer take a full on chest shot with a .308 and still keep on running. Sheer luck of the draw and nothing was hit that was an immediate show stopper. A huge eye opener to me as a kid wasn't just shooting the animals, it was cleaning them after and seeing the wounds inflicted internally first hand. I mentioned here once before, but I shot a rabbit with a .22lr Viper when I was a kid. When I cleaned it, the insides looked like someone had took a blender to it. Never saw it before, and have never seen it since, but as you said, and it's the quote of the day: Bullets do funny things. B
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#30
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The tumbling occurs when the bullet hits something, NOT while it's in flight. Btw this isn't unique to 5.56 projectiles. The 1/9 twist was adopted to stabilize the SS109 projectile, not to improve accuracy with the 55gr projectile. 1/7 is needed to stabilize match bullets of more than 69gr. |
#31
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There is no discussion here, the .308 wins every time if you are talking about stopping power. I'm not discrediting the 5.56 as I love to shoot them and have many rifles, but if stopping power is what you are looking for - and your two choices are 5.56 or .308 - then .308 wins.
Simple.
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#33
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IMHO, it's depending on the load and bullet type, the 308 is for longer range and 5.56 is more of medium range. Within 200 yards, the 308 is overkill, but I don't see many complaint about overkill...
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#35
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I'll take your word about the 1/9 barrel as I'm not certain about that. I know the 1/7 twist was to stablized tracer rounds because they are so heavy. Regarding the temporary cavity, I'm not sure I subscribe to the theory that a temp cavity larger than the body would result in an explosion, such as a rabbit. getting hit with a rifle round. Maybe. Perhaps if there was enough room for the temp cavity to form, which usually requires at least a few inches. I used to shoot squirrels with .303 British FMJ rounds and often I would have to shoot the squirrels multiple times because the bullet would go through the squirrel without killing it. Bullets do crazy things. I can say with certainty that shooting squirrels with .223 soft point ammo is a sight to behold. Center mass temp cavity has been studied a lot and it has been pretty much proven that internal organs are very elastic and do not sustain damage from temp cavity. If you want someone to die from a gunshot wound you must pierce a major blood source such as an organ or artery so the bullet recipient will bleed to death. Even then nothing is guaranteed. Statistically 80% of people shot with pistols survive. Only 20% of people shot with rifle rounds survive. |
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Don't get me wrong, getting hit at 300 yards with a .223 out of a M4 will ruin your day! But don't expect the wound to be very special like it would have been if you were shot at 10 yards. .223 bullets decelerate very fast. |
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#39
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.308 may have more knockdown power but that doesn't mean it's the right cartridge for every setting.
This is the internet so there's no end to pissing contests about "what's the best." But if you're looking for a pragmatic view on what's the RIGHT cartridge you need to think about what you intend to use it for and what platforms are available. For example for CQB I can't think of a .308 platform out there today that's superior to the M4/AR platform - for that particular use. |
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This thread is leaning more towards hunter the two legged type of prey so I'm going to side with the .308 on this one, for a few reasons.
When comparing the most common loads for the two rounds 55gr FMJ's and 150gr FMJ's. 1. When fighting a nation that CAN afford to put their war fighters in body armor the .308 does a better job of punching through flak/kevlar/striking plates. 2. hollow points and lighter bullets can be defeated by heavy clothing/IBA resulting in sub-par preformance. 3. Bigger, heavier, and more energy with less varibles in bullet grain and type of bullet. 4. Moral boost for troops knowing they have "the bigger stick." 5. Better range/power ratio at extended ranges. But when it comes down to it, like many other cal gunners have pointed out, this is the internet so this will end up being an endless pissing contest. Took me a little bit to learn this one, but fanning the fire can be just as much fun as appropriately answering a question. So with this said where are the 6.5 grendel fan boys?
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