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Firebeard

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Everything posted by Firebeard

  1. Normally, I'd be all for this, but given the preponderance of evidence that already exists(there's been studies since before WWI), deaaling with accuracy, walking fire, etc, like hell am I spending the several hundred dollars it would cost to do this test(and given that these tests don't actually demonstrate what we're trying to prove here), for the same conclusions that have already been proven. They don't just randomly decide on doctrine, they've done studies on MG employment in the US following the first world war, world war two, korea and vietnam. What you describe, hipfiring an MG, is called "walking fire", and has been a Thing since man portable automatic weapons have been(in fact, several squad automatic weapons were designed with this in mind). We /have/ figures for what you want. Comparing the accuracy of hip fired rifles, to that of hip fired MGs, isn't even remotely accurate, nor would comparing rate of fire, or recoil chracteristics. Of course, even disregarding the above, your proposed tests would geenerally violate nearly all ranges' rules, excepting some 270deg ranges for 3 gun matches. As for how long it takes to fire an MG from the hip for any given burst, look up the rounds per minute of the MG, divi8de by 60, and then multiply that figure by how many seonds our little support gunner guys are going to fire(dotrinally anywhere from 3-5 seonds, I'm going to defer to the two guys here with prior infantry background as to how long the burst should be). For an M240B(the infantry variant), that burst is going to be anywhere from 33 rounds(the low speed 650rpm setting, for three seconds) to 63(750rpm setting, for 5 seconds). For an M240G, you're looking at a low of 33 rounds(650rpm, 3 seconds), and a high of 80 rounds(950rpm setting, 5 seconds). Potential rate reductions due to fouling excluded, since they're fairly minor. I don't know how to upload the pdfs. Could you point me to a good place to, or would you prefer I email them to you. It's several volumes(some of which are broken up into parts for size).
  2. See, I /have/ shot a 1919(A4 and A6 variants), including an A6 from the hip(aided by a sling, because it weighs just under forty pounds). None of them were "too light". In fact, they rank way up there as "so heavy they're nearly unworkable for what they are". Other countries have fifty cal MGs that weigh less. I've actually shot a pretty wide range of MGs(1919A4, 1919A6, RPD, M60(mod unknown), M53(yugoslav MG42 clone)), the A6 and 60 from standing as well. They're a real treat to shoot. Echo has time on the 240, 249 and probably others. I've also burned through plenty of ammo on SAW type weapons(RPK), SMGs and a range of other guns. I've accumulated a lot of trigger time on older weapons, and the shop I worked for was an FFL07/02SOT shop. We didn't just play with them, we /built/ them. As for heating, the testing that the 1917 and 1919 underwent prior to adoption involved some positively brutal continuous fire. Prior to WWII, ALL MG's adopted by the US Army were torture testede to rediculous standards, up to and including continuous fire of over 200,000 rounds for the 1919(and more, although I cannot recall how much, for the 1917 and 1891). Yes, they get hot to the touch well before that. But nowhere NEAR hot enough to damage the firearm. You start running into throat erosion after a few belts of continuous fire, but even on guns without quick change barrels(such as the 1919, which changing barrels on is a complete and total pain in the ass), throat erosion is not an issue for a bullet hose like we're modeling here. I /have/ run out a couple belts in one sitting, at one point. It as a friend of mine's final send off(he'd died of a heart attack, and was a huge MG collector, so we did one massive magdump at the range as part of his wake). Four hundred rounds continuous, from his M60. Through one barrel. Unlike in video games, they long since remain functional despite getting hot. AND, even if they do start having heating issues, the part that wears is NOT the "feed mechanism". The feed tray and tgopcover are far enough away from the heat that pretty much everything else on the gun will be fucked up first. What you can expect to see is excessive throat erosion(which will, eventually, trash the barrel for accurate fire purposes), followed by eventual deformation of the barrel. To get to "barrel deformation and loss of correct headspace" on an MG requires heating the barrel to the point of plastic deformation, so you're getting up into the hundreds of thousands of rounds continuous fire. Some MGs may experience malfunctions long before this, due to fouling, or heat expansion affecting tight tolerances, but those still run into the thousands of rounds of automatic fire. Are you laying accurate fire, no. Are you laying fire, absolutely. The most likely malfunction is a jam due to belt malfunction, if you have the belt hanging loose rather than in a box like everybody in the world uses for carrying belted ammunition. For accurate, real information, instead of going off of he word of random people(self included), I would STRONGLY recommend you find a copy of George Chinn's "The Machine Gun". I might be able to upload my pdf copies somewhere for you to use. They are The Bible of MG development and use, from a mechanical perspective, and deals specifically with automatic weapons throughout history. It has diagrams, figures, formulas and everythging you need to know about automatic weapons.
  3. To be perfectly frank, Ron doesn't know what he's talking about. In the first case, the M240 fires from the open bolt. Ammunition doesn't cook off in the gun, period. You'd literally melt the receiver(also impossible, you'd have catestrophic failure of the locking lugs, and the barrel before then) before you got the round sitting in the feed tray to heat up enough to cook off. So yeah, not only is this not going to happen, it's evidence of his ignorance. Anybody who's operated one, or fondled one, or played with /any/ LMG excepting some of the wierd russian squad automatic weapons fires from the open bolt. For thsi reason. Even amongst the very few LMGs that /do/ fire from the closed bolt(and even lumping in the very light russian SAWs like the RPK series), you can /still/ fire a LOT of ammo before a cookoff. On the order of thousands of rounds. People have set the handguards(wood) or melted them(polymer) of those weapons on /fire/ before causing a cookoff. Ammunition cookofffs are effectively a nonissue amongst ANY weapon, unless you're doing WWI style masses of constant LMG fire(I recall one battle in which three MGs went through a combined total of just over a million rounds, in a day). The testing that any weapon from the modern era undergoes before acceptance and issue tends to far exceed combat stresses, and this is especially the case in sustaned fire and mean-round-until-failure tests. Two, as Echo says, the M240 is the US designation, and it is one of the /heaviest/ weapons in it's class, among modern designs anyway(WWII era and earlier designs are frequently heavier), although even some much older designs(MG 34, MG 42, BAR, DP28, DPM, RP28, BREN, pretty much everything but the Browning M1919 series) weighed less than the 240 does. Among beltfeds, it is the heaviest currently issued GPMG. Even including the wierd russian designs. So yeah, I would disregard most of Ron's input, and I would stick to realism as much as possible.
  4. >"Why would you trust the world to these people when the UNSC just told you to get the best you can?" >"Because they were cheaper. Hey, wanna check out the new Gulfstream V I just bought?"
  5. I'd like to second the notion of flamethrowers and grenade launchers being implemented. Flamethrowers, ideally, with a realistic(or, well, adjusted for balance and gameplay) range, rather than the hollywood 20ft one. Perhaps to balance GLs and rocket launchers, it might make sense to have the GL have a reduced power or radius from the hand grenade(handwave the GL grenade as being HE rather than frag maybe?), but longer range, while having shorter range than the heavier/slower rocket launcher?
  6. You speak an awful lot of the same tired, overly repeated myths. In ballistic testing, 7.62x39 does considerably less in terms of permanent cavity damage than either the 5.45 or the 5.56, wich 5.56 being consideraboly more effective due to fragmentation effects(compared to the tumble effects of the 5.45, which creates a considerably larger temporary cavity, which is fairly irrelevant in terms of immediate effectiveness, even though it may render a much larger area of dead tissue in the long run). 5.45 out of an RPK74 has less armor penetrative capacity than a 249 firing 5.56. 7.62x39 penetrates a thicker layer of steel, yes, but atthe cost of significantly less effective terminal ballistics, significantly reduced range(7.62x39 has an effective range of 350yds roughly, compared to the 500-600 for either of the other two rounds). The RPK is also considerably less accurate as a platform, due to the shoddy machining tolerances it is manufactured towards, and as much as loose tolerances is spun as a design feature, when it gets so bad that you have to number and sort your parts based on how in-spec they are(AK platform weapons parts all have small numbers on them, indicating whether they are slightly undersize, in spec, slightly oversize or very oversize), because otherwise you can't put them together and have them work, it's not a feature, it's shitty quality control. The AN-40 and AK-100 in 7.62x39 are offered for export use, and are not used internally. Or, for that matter, by ANY military force in the world. At all. Ever. The 7.62x51 was not brought up, but there's a reason NO nation uses it anymore for a main line rifle. It suffers from excessive recoil, while being entirely more weight than is needed. The M14 was not a wonder rifle, it was a rifle that was dropped from main line infantry use very rapidly on account of it being underperforming compared to either of it's contemporaries(the G3 and FAL platforms). It did not have a "90% killing rate". I can't think of any round that fits into an infantry rifle with that kind of performance, or even close to it. Have you ever shot an AK or AR platform weapon on auto? If so, you would know immediately that your claim about controllability. I've shot both(several variants of both, actually). An AK on auto groups absolutely terribly, with hitting a man size target with all rounds of a burst at any reasonable difference being nigh impossible. While an AR pattern weapon on auto is extremely controllable, albeit still less acurate than it would be on semi, keeping all shots in a burst in a head size target at 100yds on auto is entirely doable. It is worth noting that even Russian and Chinese special forces uunits operate M4 platform weapons(either purchased, license-built or clones). Literally every special operations force in the world that has the money(meaning all the competent ones, plus the Russians and Chinese) run M4 platform weapons now. There is literally zero reason for any country to be using a substandard weapons system except for cost reasons, and absolutely no reason at all for an elite paramilitary unit(like we're discussing) to run such a substandard weapon.
  7. Firebeard. Gunsmith and goat farmer from the green mountains.
  8. I'll go a little further than Echo. Russian weapons offer literally zero advantages over western weapons(which is why you see even some Chinese units operating license-made M4s now). The AK platform is heavy, the stock configuration(specifically the amount of drop it has) makes effective automatic fire with it much more difficult due to increased muzzle rise, the RPK has those problems and a low capacity for a SAW, none of them can readily mount optics in a way that will retain zero when removed and reinstalled(AK sidemounts are possibly the only thing worse than the G3's claw mount, and that's really saying something). Reliability is a nonissue(both Western and Warsaw Pact weapons tend to be considerably more reliable than tthe internet would have you believe), although the mechanissm that supposedly makes the AK "more reliable" in fact results in increased felt recoil. In addition, the AK platform weapons have extremely clunky manual of arms, making anything you haave to do to operate the weapon that much slower. Paddle releases and mags that have to be "rocked in" are slower than STANAG compatible mags and require more operations. Putting the charging handle on the right hand side requires you to reach over the top of the weapon to charge it. As for ammunition, the AK74's 5.45 is less accurate than it's western counterpart, while actually being less effective terminally in the short term(tissue death due to temporary cavity is irrelevant in this aspect, and even then the 5.56 does it better), it penetrates cover less effectively than 5.56 does(M855 ball and M856 tracer are both pretty decent penetrators), while being every bit as prone to overpenetration of sofft tissue as 5.56. If you went to the even more obsolete 7.62x39(out of the 47), you do gain penetration over the 5.56, at the cost of increased recoil, decreased accuracy(it's even less accurate than the 5.45), and massively decreased terminal effectiveness. Even the Russians abandoned this round, and that should tell you something when the same country that has been clinging to the same obsolete design for 60+ years drops something. Neither the 5.45 nor the 7.62x39 are more damaging than the 5.56 is, for the task at hand. Russian calibers are substandard for nearly all applications. Period. Ammunition commonality is important, even for specops. If you can't reliably get ammunition, you are up shit's creek without a paddle, and exotic calibers(say, China's new 5.8, or H&K's 4.6) and weapons that take different magazines and parts than the rest of your team has is a good way to end up up said creek. There's a reason any country who can afford to buy western arms uses them, and not russian weapons that were obsolete 40 years ago. And that's because Russian weapons are inferior in every regard(except cost).
  9. Helmets are spall protection, (the best ones do meet level III-A, but hits by anything meatier than shrapnel or very light handgun rounds at shallow angles of incidence will generally result in traumatic neck injuries or worse). The 12.7x108 round fired by the DShK and similar deliver comparable energy to the .50 BMG, and for all intents and purposes somebody taking fire from them won't be able to tell them apart without being familiar with the sounds of both weapons firing. Somebody over there would be able to distinguish the difference, but for our purposes the difference is academic(they throw comparable velocities and energy). In addition, captured/loaned M2s are surprisingly available in that part of the world(a friend sent me back some pics from a-stan I'd be happy to link of about a dozen older model M2s rusting away in a scrap pile). It's obviously not as common as leftover Warsaw Pact hardware, but they are floating around.
  10. You can give the guy the benefit of the doubt, but that would make you a fool. People get grazed by bullets all the time and live. People get grazed in the helmet by bullets on occasion, and live. But those are small caliber bullets. The amount of energy imparted on the helmet at a 1deg angle of incidence, from 2000 yds, by a .50 cal is just shy of the same energy putting the muzzle of M16 up against the side of the helmet(at 90deg incidence) and pulling the trigger. It's not that the round was a "near miss" that's the problem. It's that the round supposedly hit with enough energy to result in "a stiff neck", but didn't kill him. The window between the two, as I've explained above, is less likely than me seeing Echo in a dress. If it hits the head, it's going to have enough energy to kill. If it misses, that's not a hit. Period. Ricochets straight backward that strike shooters are surprisingly common(typically the result of a range that's way too leaded up to be safe, and poor berm design, I've been hit by several in indoor ranges and refuse to shoot in them anymore because of it, that shit stings like a motherfucker), and lose energy rapidly. Ricochets that hit anything else are extremely uncommon. Unless he was shooting a fifty, on a square range, the likelihood of said hit remains pretty much nil(and if the poster had any measure of honesty, would have mentioned that it was a ricochet). So he's either outright lying, or (on an extreme longshot) he's stretching the truth intentionally(still lying in most people's books). The odds are so far against it that no sane person ought to consider him anything less than a liar. EDIT TO ADD: Which is more likely, that he saw somebody survive something this unlikely, or that he is, in fact, full of shit.?
  11. A hit on a shallow enough tangent to not snap the guy's neck, but still be notable as any kind of "took a hit" is such a tiny area that it's effectively not going to happen. It's about as likely as your "maybe the round fizzled". The line between "hit" and "miss" with .50 cal works out to be under an eighth of an inch. So no, they don't happen "all the time" or even close. Lighter rounds yes, but once you start throwing around that much weigh, the likelihood shrinks to nigh impossibility. The information provided showed quite a lot(an approximate range, that the person claimed he saw it firsthand, the poster's ignorance). So I'm not inclined to give the benefit of the doubt to somebody who doesn't even know what their issued helmet is made of(Echo, care to chime in on if that is taught formally?). This guy's story is about as likely as a man getting bitten by a great white, while being struck by lightning, twice, in the middle of a tornado. In Idaho. And I've heard way too many similar stories(always from people who can't prove that they even have a military background at all) from others in my line of work.
  12. They don't know how far it was, but had an approximate. So to be safe, I used /twice as far/ as their approximate. Angle is largely irrelevant to this provided it strikes secantially or directly, while a tangential impact will have progressively decreasing levels of energy imparted, excepting that a tangential impact in this case is going to put a hole in that guy's head anyway(even at 2000yds, that bullet has enough energy to hole both sides of the helmet at ANY angle), and even assuming an infinitely strong helmet will exert enough energy rotationally to twist and snap the neck. Of course, the figures above are completely ignoring that the helmet would have been compromised and his head pulped, by assuming an arbitrarily strong helmet. I tried to give the target every possible advantage, assuming a range twice the estimate, a secantial impact and an infinitely strong helmet and it still results in a fatal impact regardless, either through the helmet being compromised OR through traumatic head and neck injury. Of course, if the individual actually was telling any manner of truth at all, they would have known that there aren't any "plates" in a helmet, and that anything inside of two miles with a .50 won't be "pretty slow". Being "sparse with details" doesn't count in your favor when you're making blatantly impossible claims and showing massive amounts of ignorance of things you'd be educated on if you were actually in the military. I did do my calculations for 1 degree of incidence, on the secant. Anything more aggressive than that is going to put a hole in the target's head. Literally anything that strikes the helmet with the full diameter of the bullet at that velocity and energy is going to be almost three times as much as required to snap the neck. If it doesn't strike on the secant, but rather on the tangent, unless it strikes on an absurdly low percentage of the frontal area, it's going to have more than enough energy to again snap the neck(or penetrate the helmet). Lighter rounds are readily deflected by a helmet, but when you're throwing that much around, you're exceeding the amount the spine can handle. We don't know for sure, but when a person claims "1km away", that means they at probably have an idea of the distance to the contact, even if it is't precise. To give him the benefit of the doubt, I gave it twice the range, which is significantly reduced energy and velocity from 1km(as you can see). Somebody speaking out of complete ignorance(again, I point to plates in a helmet) is a pretty good sign they're full of crap, especially when they throw in "I saw somebody" as a vagarie, and when people start making such claims, the burden of proof is on them. A more important question might be why you're going so far out of your way to defend somebody who is telling some really tall tales, with really sketchy information.
  13. Echo summoned me for this thread(I'm a gunsmith and ballistician, the neuroscientist to Echo's neurosurgeon, if you will). I live and breathe this shit. I'll run these figures assuming Barret's .50BMG data(velocity, weight, BC, etc.) are correct to start with. Finding reliable data for velocity out of an M2 or DShK is nigh impossible(and I don't have one), so I'll estimate from minimums(M82CQ with a 20" barrel). Round is 661gr with a BC of .611 Muzzle: 9174ft/lbs @ 2500fps 500yds: 4980ft/lbs @ 1842fps 1000yds 2596ft/lbs @ 1330fps 1500yds: 1533ft/lbs @ 1022fps 2000yds: 1148ft/lbs @ 884fps So, even assuming that the round came from 2000yds(which is ridiculous, you'd have trouble even seeing a person or small group of people unaided at that range in any kind of practical environment), it's packing almost as much energy as a .223 has at the muzzle. That is a positively massive amount of force(more than it seems like), even on a graze. Modeled as an elastic collision(the most beneficial way to model it for the survival of our hypothetical soldier) using a 3lb helmet and figures for 2000yds we get final (rounded) velocities of: 830fps for the bullet 54fps for the helmet 3lb helmet moving at 54fps = 135ft/lbs of energy imparted to the skull by the helmet. This energy has to go somewhere, and that somewhere is the head and neck of the target. Pulling some figures from another individual calculating bullet/head impacts(specifically JFKs) regarding spinal cord injury - http://karws.gso.uri.edu/JFK/Issues_and_evidence/Frontal_shot%28s%29/Tobias_frontal_shots/Head_snap.html The bulk of this text is irrelevant for other reasons(such as calculating how much force was imparted to JFK's head to result in the neck snapping motion and rebound back and to the left), but the math works out and it's a good indicator for how far the head would have had to travel to result in traumatic injury to the spinal cord.In conclusion, even assuming the helmet DID survive the impact(the angle of incidence was low enough to not be penetrated by the bullet, by some miracle), and assuming that the helmet didn't move against the head during the impact and impart even further force to the skull, the "friend"'s neck would have been snapped, and he would likely have died or been paralyzed for life. ...so yeah, I'm calling bullshit. If you or Echo would like me to calculate energy of the bullet after striking something hard, ricocheting and hitting the target, I can, but the result is largely irrelevant to the issue at hand(it will still be more than double the required amount). Thank you for your time, Paul P.S. - Ammunition seldom "fizzles". And by seldom, I mean "doesn't happen", at least not in the manner described. When ammunition malfunctions, it is typically either due to age and poor storage(in which case it may hangfire due to bad primers, squib due to nonfuctioning powder or just not fire at all due to bad primers again) or due to poor quality control during manufacture (which due to how the machines work, does not result in light charges, but rather no powder or even rarer a double charge, resulting in either a squib or pressure damage respectively).
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