|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Today's Posts | Search |
|
Thread Tools | Search this Thread |
March 23, 2017, 11:33 AM | #101 | |
Senior Member
Join Date: July 20, 2016
Location: Upstate NY.
Posts: 901
|
Quote:
This is the same reason you don't try shoulder shots when hunting with a lightweight bullet. It has energy, but gets its energy from velocity instead of mass and so it applies that energy differently when it contacts the target. Use what works... incidentally, when shooting living creatures, most bullets seem to work ok.
__________________
In God we trust. |
|
March 23, 2017, 12:27 PM | #102 |
Senior Member
Join Date: January 3, 2017
Posts: 1,583
|
This is why HP bullets have had a big following in the metallic silhouette games. The bullet spends more time in contact with the target before the energy disintegrates it. It is also why equal weights of slug and shot from a shotgun leans to the shot being more effective. The amount of momentum is important but the time it is applied to the target is even more important.
|
March 23, 2017, 12:28 PM | #103 | |||
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
Quote:
If that "slap" imparts the same impulse to the door, the result will be the same. When one continues to "push" the door, the relevant factor in the elastic collision becomes force times distance, which is work, or kinetic anergy. Quote:
|
|||
March 23, 2017, 01:07 PM | #104 | |
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
But it would not be. After the projectile stops, or more accurately, after the projectile changes velocity, momentum is no longer being applied to the target. It may seem counter intuitive, but an arrow that bounces off a target will impart more momentum to the target than one that sticks to it. |
|
March 23, 2017, 05:33 PM | #105 | ||
Senior Member
Join Date: February 27, 2008
Location: midwest
Posts: 4,209
|
Quote:
__________________
rather be judged by 12 than carried by 6 Quote:
|
||
March 23, 2017, 09:47 PM | #106 | ||
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
One who slaps, punches, or otherwise strikes something may be doing so by moving much more mass than that of only the face of the hand or of the palm of the hand or of the fist. I did say that momentum--the impulse--would be equal. If it is, it will result in the same door movement. BUT--the analogy of striking someone with a body part is not really a very good one, and it only applies in the abstract. That's because in reality, when one pushes on a door, or on a hinged steel target, with the body--any part of the body--the transfer of energy and momentum continues after the instant of contact. That's because the muscles continue to exert force. Not so with a bullet. All of the energy and all of the momentum that a bullet has available to impart to another object was imparted to it at the instant of firing. There will be no more. That differs from pushing on a safe door with bodily force. The the analogy is really not a very good one. But if we were to throw something at the door of the safe, we would find that the movement of the door would be proportional to the momentum of the thrown item--the mass times the velocity--before the collision, regardless of what it was that was thrown. Kinetic energy would be conserved only in an elastic collision--one in which neither object is deformed. |
||
March 23, 2017, 11:06 PM | #107 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
Many of us carry a handgun for different reasons, I live out in the boondocks and am probably more likely to run into feral dogs, coyotes cougar, wolves or black bear than a criminal or terrorist. My favorite carry gun is usually a 1911 in 45acp loaded with 230gr. cast trunce cones travelling about 850fps. I have a lot more faith in this than any 9mm load. I know it's not a very scientific test, but I shoot a lot of steel targets at various ranges and when shot with the 9mm's they ting when hit, when hit with the 45's, they really thunk and swing. Also when shooting blocks of wood, the 9's will move them around and often knock them over, but when shot with the heavier 45's they tend to fall more often and get blown back further. There must be something to this. It would be pretty darn hard to convince me the 9mm is as good of stopper as the 45, and I feel the 40S&W is right up there with the .45acp..
|
March 24, 2017, 08:06 AM | #108 | ||
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
Quote:
|
||
March 24, 2017, 08:56 AM | #109 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
I will disagree, it's all about weight and bullet surface. As the OP said, the larger calibers knock down poppers better than the 9mm, it's because their BIGGER.
|
March 24, 2017, 09:23 AM | #110 | |||
Senior Member
Join Date: February 27, 2008
Location: midwest
Posts: 4,209
|
Quote:
Quote:
__________________
rather be judged by 12 than carried by 6 Quote:
|
|||
March 24, 2017, 01:25 PM | #111 | |
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
It's basic physics. From Newton's Third Law we derive the law of momentum conservation. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. The momentum of each object is the product of its mass and its velocity. A velocity vector has both magnitude and direction. |
|
March 24, 2017, 01:26 PM | #112 | |
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
But momentum is conserved.... |
|
March 24, 2017, 02:15 PM | #113 |
Senior Member
Join Date: September 15, 2010
Posts: 1,850
|
This thread is as entertaining as the countless ones before it. I find it interesting comparing the performance of a 9 mm or .45 on poppers, and using that information to predict their effectiveness on humans.
There's a mountain of evidence showing that the difference in service calibers using quality self-defense ammunition on humans is very small. Being able to put rounds quickly on target is far more important than caliber. In light of this, shooting a service caliber in the weapon that one shoots best , i.e., quickly and accurately gives one the best chance of winning a gun fight. For a high percentage of us that is best done with a 9 mm. Yes, a .45 has a nicer ring on steel than 9 mm. It also bangs solid targets around with greater authority. Using that to extrapolate that a .45 is a better self-defense choice for you or me is a mistake.
__________________
"Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin |
March 24, 2017, 03:52 PM | #114 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
So your saying six fast punches of a 60lb. person will put you down faster than two punches of a 250lb. man. If weight and size have nothing to do with it, when dangerous game hunters go into the brush after a wounded animal, why are big bore rifles and shotguns more desireable than say a .223 bolt action. If fast hit's count, why do we all not carry .22lrs. Mathematical equations, only go so far in real world fight stopping.
|
March 24, 2017, 04:04 PM | #115 | |
Senior Member
Join Date: November 21, 2011
Location: Southern Louisiana
Posts: 1,399
|
Quote:
|
|
March 24, 2017, 04:07 PM | #116 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
Is a single shot 9mm, just as effective as a single shot 45.
|
March 24, 2017, 04:08 PM | #117 | |
Senior Member
Join Date: November 21, 2011
Location: Southern Louisiana
Posts: 1,399
|
Yep.
You got anything that proves that it's not? It would be nice to see the longest running debate on the internet finally settled! Quote:
Last edited by 45_auto; March 24, 2017 at 04:34 PM. |
|
March 24, 2017, 04:08 PM | #118 | ||||
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
Quote:
Quote:
Quote:
The key variables are penetration and rapidity of controlled fire. For assessing penetration, people evaluate performance in surrogate media. It has been determined by the experts that premium grade 9mm loads are adequate for self defense. Rapidity of controlled fire is important only insofar as it increases the probability of achieving proper placement timely. One of the things that enable more rapid controlled fire is reduced recoil. |
||||
March 24, 2017, 04:19 PM | #119 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
Since the invention of firearms, military and big game weapons have always been large bore weapons, the smaller stuff just didn't cut it when defending yourselves. Small caliber guns came about for the ease of carrying, not because they were more powerful, they were also easier for frailer people too handle. But as far as shot for shot, I believe that the bigger calibers are more effective.
|
March 24, 2017, 04:28 PM | #120 |
Senior Member
Join Date: January 3, 2017
Posts: 1,583
|
A bullet from a pistol has very little momentum compared to a 200 pound man walking at 6 fps. A 12 ga. shotgun with a 1-1/4 once load at 1400 fps has enough momentum to stop a 200 pound man walking at 6 fps. Stopping the advance can give you time for another shot but it doesn't necessarily kill instantly. On the other side is that more often than not an attacker will lose enthusiasm for a confrontation when confronted with a gun. I never plan on that happening but it is very often the case. Even multiple attackers rarely press ahead when confronted with a gun.
There has been a big part of the equation missing in this exchange. The more aware of your surroundings the better your chance to be prepared. Looking someone in the eye and greeting them can often disarm a situation before it starts. I would not rely on that but most crooks want an easy target. I know that you can't always have your head on a swivel or be constantly aware of everyone approaching or departing from your space. What you can do is not allow yourself to go into tunnel vision when the woman in a tight sweater or short skirt approaches. Just keep your eyes, ears and gut feelings open to the area around you. If a 89 year old woman can stand up to three twenty-something thugs using her wits and a shotgun then most of us can too - if we are prepared. (she never fired a shot and turned all three over to LEO after preaching a bit about Jesus while they waited.) |
March 24, 2017, 04:43 PM | #121 | |
Staff
Join Date: June 8, 2008
Posts: 4,022
|
Quote:
That meant that "shot for shot", the smaller bores were more effective. Of course, lighter ammunition was important. For big game, there have been differences of opinion, as exemplified by Newton and Weatherby on one side and Keith on the other. Of course, one would quesion the wisdom of anyone who took a .50-110 on a one-shot antelope hunt. But none of that is relevant to the subject at hand. In a self defense shooting against a human attacker, "shot for shot" effectiveness merely has to be good enough. The unwanted side effects of having more are not helpful at all and will work to the defender's disadvantage. |
|
March 24, 2017, 04:53 PM | #122 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
Well work calls, it's been fun, how about tomorrow we argue Ford VS Chevy.
|
March 24, 2017, 04:56 PM | #123 |
Senior Member
Join Date: November 21, 2011
Location: Southern Louisiana
Posts: 1,399
|
You'll lose that one too.
|
March 24, 2017, 04:59 PM | #124 |
Senior Member
Join Date: September 15, 2010
Posts: 1,850
|
wwg, using Cape Buffalo to make your case is no more effective than poppers. Yes, if you are hunting dangerous animals in the bush a powerful round is needed. Why? To assure you can achieve enough penetration to immediately incapacitate the animal. As the chart above shows, you don't need a .500 Nitro Express to do that in a human. In fact a 9 mm works just as well as a .45.
You will have to show some evidence the military handguns of old would be more effective than a modern 9 mm with modern high quality ammunition, for stopping humans. Good luck with that.
__________________
"Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin Last edited by K_Mac; March 24, 2017 at 05:17 PM. |
March 25, 2017, 01:27 PM | #125 |
Senior Member
Join Date: August 20, 2014
Location: northern Mn.
Posts: 271
|
So, according to the chart above, the wound track channels, with the 45 and ,357 Sig are twice the size as either 9mm loads. Also, I never said anything about the big bore muzzleloaders comparing with modern firearms, only that back in the day, when you had one shot, the bigger bores seemed to be more effective than smaller bores. Must be something to this, given one shot bigger seems to be a better choice than smaller. It is easier to put multiple shots with a 9 on target, but what if you only have the one shot. One on One the .45 should be more powerful.
|
|
|