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November 18, 2017, 08:43 AM | #101 |
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Back to an original thread topic, bullet tech.
10mm has the velocity potential to make most HP bullets expand, (IME) Nosler, XTP, Gold Dot. New bullet tech not required, regular HP sufficient. At 1,400 fps the Nosler 150 JHP and 155 XTP will expand after 4 layer denim when shot into water filled gallon jugs, 150 Nosler will fragment, blow jacket (core ~.5x still penetrates into 4th jug).
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November 18, 2017, 09:23 AM | #102 | ||
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In addition, there is a lot of expansion testing data out there which makes it easy for people to verify the performance of various defensive ammunition loadings. Here's one such resource. http://www.brassfetcher.com/Handguns/Handguns.html
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November 18, 2017, 09:34 AM | #103 | ||
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Think geometry for a moment. Think in three dimensions. Imagine putting an amorphous, life sized three dimensional target somewhere in front of you at close range. Mark some place on the surface in red. That's your entrance wound. Now, you will not know just what the bullet will do inside unless you are a forensic surgeon, but imagine that you do. Perhaps your one shot went in just right and hit something important, but perhaps it did not. In your mind, turn the "attacker" one way or the other on a vertical axis, and bend him forward or backward and twist him. Imagine making the same entrance wound from the same place. Realize that the bullet path will result in the destruction of different things inside the body. Perhaps your first shot did not do anything really effective, but your second one did. Perhaps it was the other way around. Perhaps neither one would have been effective. I have seen an excellent 3-D graphic illustration of all of this, but I cannot find it. Now add in linear motion. Let the target move however far it will in your split time, and let it move just over seven inches more in your .04 second split time difference. This little mental exercise should illustrate what led Messrs Patrick and Hall to write, in the work cited above, that shot placement is "more serendipitous than designed", and to speak the importance of being able to shoot rapidly. This is also what led Rob Pincus to conclude " for all shooters, at some point, there will be a moment when they can fire one more round of 9mm in any given period of time. That extra round’s capacity to wound will far outweigh the miniscule difference in potential for any individual bullets". Lest this be seen solely as something about big bullets vs small, people should also realize that everything said above would apply to a comparison between a good service-size pistol with adequate mass, a good grip, and a low bore axis, and some pocket pistol. |
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November 18, 2017, 10:43 AM | #104 | ||||||||||
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That most training routines are based on the notion that they won't stop is true enough. Training that you describe is for worst case scenarios, not because most scenarios are worst case.
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November 18, 2017, 11:19 AM | #105 |
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I am one that uses standard pressure quality hp 9 mm ammo for self-defense. The very small difference in +P performance does not justify the greater recoil in my opinion. I'm faster and more accurate on follow up shots.
There may be some who are as fast and accurate with a smaller .357 and full house loads, even an all steel one like an SP101, but I have not seen any. Comparing a midsize revolver in .357 or a full size 1911 in .45 acp to the guns most of us carry daily doesn't tell us much, other than even with handguns larger and heavier than most carry, split times are slower with those calibers. I have and like both, but I carry a compact 9 mm (10+1) most of the time. Based on my research, training and experience I believe it gives me my best chance of surviving a gun fight. I share that opinion with many whom I trust and respect. For the record, some of those guys carry .40 or .45s. Carry what works best for you.
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November 18, 2017, 11:24 AM | #106 | ||
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When the targets are human, there is no reason to imagine that here would be any material differences. In terms of duties, yes, but not in wounding mechanics. Quote:
Personally, I have never come upon any credible source that contends otherwise. |
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November 18, 2017, 11:48 AM | #107 |
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Well, this thread has wandered around a bit, and it seems we're currently passing through the one shot stop zone....
Missing fast doesn't win a gunfight. Only hits matter and only hits where the bullet reaches a vital spot result in rapid incapacitation. I don't care if you fire one round, and get one hit, or fire 15 and get one hit. (though a court might, ). That one additional round (in a given, and very short amount of time) you might get from the "softer recoiling" faster shooting 9mm might be the one that saves your butt. OR it might be the one that goes through your neighbors walls and kills Grandma, or baby Jane. I'll believe big bullet technology is "dead" when the factories stop making big bullets due to lack of sales...
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November 18, 2017, 12:06 PM | #108 | |
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I am first and foremost worried about defensive gun use. Light competition is for fun and trigger time. I was a Ft Worth Cop in the 80's for several years before going to the Border Patrol. I have seen more than a few people shot and will gladly take the difference in the magnum class defensive gun.
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November 18, 2017, 01:42 PM | #109 | |
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Take one competent shooter, then compare his split times across calibers platforms. That is much more scientific |
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November 18, 2017, 02:01 PM | #110 | |
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For strong side IWB (3:00) a 1911 is more comfortable - for me. I have 1911's in 45 acp and 10mm and do not plan to buy a 9mm 1911. Comparison between a 1911 in 45 acp and 10mm (big bullets as related to thread topic) Speed of follow up shots is a factor but no timer in this example just subjective and a calculation. Calculator: http://www.shooterscalculator.com/recoil-calculator.php 2.5# firearm weight assigned for 1911 Actual power charge for 10mm handloads, 45 acp powder charge assigned from AA manual 10mm Handload 180 Gold Dot @ 1,152 fps / 531# KE - recoil energy 8.1 - PF 207 10mm Handload Nosler 150 JHP @ 1,402 fps / 655# KE - recoil energy 9.4 - PF 210 10mm Handload Hornady 155 XTP @ 1,400 fps / 675# KE - recoil energy 9.6 - PF 217 -------------------------------------------------------------------------- 45 acp Federal 230 HST @ 891 fps / 406# KE - recoil energy 7.8 - PF 205 45 acp Winchester 230 Ranger T @ 915 fps / 428# KE - recoil energy 8.2 - PF 210 45 acp Remington Golden Saber 185 +P @ 1,157 fps / 550# KE - recoil energy 9.0 - PF 214 Subjectively the 180 gr. 10mm Gold Dot has similar recoil and speed of 2nd shot as 230 gr. Ranger T The calculations of recoil energy and PF support my subjective impression. Objectively the moderate 10mm 180 Gold Dot has about 20% more KE than 230 45 acp Ranger T (whether one thinks KE makes a difference or not) Capacity favors 10mm with an extra round. Yes, I do carry that 180 Gold Dot handload, same velocity as DoubleTap Colt Defense: http://www.doubletapammo.net/index.p...product_id=769 Before anyone replies about carrying handloads being a bad idea or references H. Fish, I know and I know. I've only shot a few factory rounds of 175 Critical Duty in the Delta Elite, the other hundreds of rounds have been my handloads, they function 100%, they're accurate and approximate factory velocity (above link). I've tested the 180 Gold Dot and after 4 later denim shot into water filled gallon jugs expansion is .75 - .80 (tested twice) Remove the denim (just water) and it "over expands" to the point of pushing petals down closer to base resulting in smaller diameter of about .65 Either way, I consider bullet performance about perfect at cited velocity. I do have a use for a pocket pistol, carried as a 2nd option to the 1911 IWB on my belt. Benefits of 2nd option PM9 include: -put hand on it without revealing I'm carrying -primary pistol suffers part breakage or demonic jam -carried in weak hand pocket in case something happens to dominant hand Yes, I have shot the PM9 one hand weak hand with carry ammo (Corbon 115 +P) and it was less abusive to my hand than a LCP 380.
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November 18, 2017, 02:07 PM | #111 |
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I see no evidence that the larger bore handgun rounds are being left behind. When new bullets or ammo are introduced, the most popular calibers seem to be included.
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November 18, 2017, 02:07 PM | #112 | |||
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But after carefully observing many people shooting for several days, one does start to notice a meaningful pattern. No precise measurements, but something from which one can draw conclusions. Quote:
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It's Newton's Third Law. The mass of the gun and the mass and velocity of the projectile and other ejecta will determine the recoil velocity vector of the gun. The grip and the bore axis will influence the muzzle rise. A Model 1911A1 with full loads will recoil more than a 9mm version of the same pistol for any shooter. Use the old pre-A1 grip for both and the same thing will be true. I haave no idea how the A1 grip might influence shooting speed, but I do now that it can mean a lot in terms of pointing. |
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November 18, 2017, 04:18 PM | #113 | ||
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It should be very obvious that there is an accuracy/speed advantage in shooting pistols with less muzzle rise--if there weren't, the practical pistol competitions wouldn't classify guns/alter scoring based on "power factor". The amount of the advantage obviously isn't constant across the range of guns & shooter skill levels, but it's always there. But let's take a look at what small split differences do as time progresses from the start of a gunfight. An earlier post quoted a 0.04 second split difference which sounds quite small. However, a 0.12 second split would work out to 9 shots in the first second while a 0.16 second split (0.04 seconds longer) works out to only 7 shots in the first second. In fact, assuming a 1.5 second draw time, that scenario (0.12 splits vs 0.16 splits) gives the faster shooter a 1 shot advantage just 0.36 seconds after he/she fires his first shot. At that point (1.86 seconds after starting the draw) the faster shooter will have fired 4 shots while the slower shooter won't get off a fourth shot for another 0.12 seconds. So about a third of a second after the first shot is fired, the faster shooter already has a one shot advantage. If the gunfight lasts for 2.5 seconds (including the 1.5 second draw time), then the faster shooter will have fired 9 shots while the slower shooter will have only had time to shoot 7 times. An advantage of 2 shots just 1 second after the first shot is fired. Three seconds after the draw, the shots fired advantage has now grown to 3 shots. Of course, those examples assume that both firearms have sufficient capacity to fire the requisite number of shots--but that's a topic for another thread.
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November 18, 2017, 06:59 PM | #114 |
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John, I think you are over thinking this. You make it sound as if a gunfight is gonna happen squared off at high noon.
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November 18, 2017, 07:56 PM | #115 |
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There are many, many very complex aspects of gunfights. Things that can be difficult or impossible to understand even when huge amounts of data are available and one has the resources and ability to perform very complex analysis.
Then, on the other hand, there are things that are quite simple and can be easily understood and explained quite easily. Understanding that muzzle rise results in shot recovery time increasing, and then relating that difference in recovery time to the number of shots that can be fired in a given amount of time is quite simple and can be thoroughly explained with basic mathematics and rudimentary analysis. In my opinion, it makes a lot of sense to take the opportunity to understand the simple things when one happens upon them. Not because they provide a thorough understanding of the overall picture, but because they allow insight into one more small piece of the overall picture. And then that's one less thing that's wrapped up into this huge, unknowable cloud of mystery.
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November 18, 2017, 10:15 PM | #116 | |
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"Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin Last edited by K_Mac; November 18, 2017 at 10:22 PM. Reason: Incomplete thought/ sentence |
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November 19, 2017, 05:28 AM | #117 | |
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I neither know, nor do I care to know - what - a "split time" refers to. Please, don't tell me. I really don't care/want to know. One huge reason I avoid competition like the plague is - I believe more effort is spent on making one a "good competitor", than goes in to making one a "survivor". |
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November 19, 2017, 06:33 AM | #118 | |
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November 19, 2017, 08:10 AM | #119 | |
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For example; My work/shooting partner is a IDPA 5 gun master. His first focus when looking at most guns is competition, my first focus is carry/SD role.
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November 19, 2017, 09:18 AM | #120 | ||
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.12 splits would be 540 rounds per minute just shy of what a M16 is, extremely unrealistic for the average shooter.
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November 19, 2017, 02:52 PM | #121 |
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mavracer there is no question that .12 splits are lightning fast. There is also no question that 540 shots per minute from a handgun is a bit faster than the average shooter can manage. I don't know how that is relevant to this conversation. Whether my (or anyone else's) split times with a 9 mm are .16 or .56 it is a very good bet that with a similar size and weight handgun in .45 or .357 they will be slower. The average shooter will also be more accurate with the 9 mm. You can spin that any way you want, but those are simply the facts.
Are the differences enough to change the outcome of a gunfighft considering bigger holes and greater velocities? That is less certain. I believe it is. Y'all believe what you want.
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November 19, 2017, 04:41 PM | #122 | |
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Anyway, that said, it is true that 0.12 splits would be very fast shooting--not out of the realm of reality by any means, but certainly very fast. It is also true that the faster both shooters are, the more rapidly a given split time difference will add up into a larger shot advantage. Here's an example that compares a faster shooter with 0.2 second splits and a slower shooter achieving 0.24 second splits. Obviously after the first shot, the faster shooter is going to get off his next shot before the slower shooter and that will be the case until the faster shooter's 7th shot which will happen simultaneous to the slower shooter's 6th shot. By the faster shooter's 8th shot, 1.4 seconds after both shooters fire their first shot, the slower shooter would still have only fired 6. At the faster shooter's 14th shot, the slower shooter will have only fired 11. If you have split values that you like better, post them and I'll run those too.
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November 19, 2017, 05:29 PM | #123 |
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I think the first "high tech" bullet I ever saw was the Speer 200 grain 45ACP bullet with a quarter inch hollow point. It easily expanded at 850 fps and it was made long before the "new" 9mm bullets. Not a bullet made today has been left behind in the technology race except for the 358 cast 158 grain Kieth style bullet. There is just no way to improve that one.
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November 19, 2017, 08:16 PM | #124 | |
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November 19, 2017, 08:58 PM | #125 |
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That bullet actually performed better than some of the old design hollow points. Flat point,gut spreading taper,sharp shoulder. If you are going to fire a round that has no expansion you can at least make sure that it doesn't just squirt through like a needle.
A lot of the older designs just didn't expand, and didn't do much better than a round ball. I have several old brands from over half a century ago and some of the .357 ones have cavities that wouldn't even fit a bb. Most of them are as hard as steel. I did some expansion and penetration testing and with a lot of them, other than the rifling marks there was no evidence that they had been fired at all.
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