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"Knockdown power" is subjective, and truthfully, isn't really a correct term. However, .38s and 9mms have different efficiency depending on the specificication of the particular cartridge and the barrel length of the gun from which it's fired. It's difficult to compare the two with any real accuracy because there are too many variables. If you don't have access to any ballistics charts, try an internet search for handgun ballistics and compare them for yourself.
IMPROVING ANSWER: If you believe that a lighter but faster bullet is the one that dumps the most kinetic energy into the target, the 9mm will be measurably better at "knockdown" because although the bullet is slightly lower in mass it will hit with maybe 30% faster velocity (compare 800 f.p.s. for the .38 with maybe 1,200 feet-per-second for the 9mm).
But the .38 special will use longer and heavier bullets, with 158 grain being common and even 200-grains sometimes.
As a matter of the science of physics, the energy formula for a moving object depends on velocity squared, or velocity x velocity. So that means that velocity is more important than mass for achieving a high level of energy.
But in a practical sense, it's not "kinetic energy" that knocks down a bad guy or a big game animal. The most kinetic energy a bullet can deliver is equal is to the kinetic energy that the gun produces on the shooter's end-- recoil.
What else can I help you with?
What is the difference between a browning hi power in 9mm and one in .40 cal?
The caliber for one.
Which has more knock down power 380 caliber or 32 caliber?
Depends on which cartridges- there are dozens of different .32s. If you mean a .32 S&W, the .380 has more energy- but the term "knockdown power" is pretty misleading. You should not expect any handgun to "knock" a person down. Works in the movies, not in real life.
What is the best and the most powerful air rifle you can get for under 200gbp?
I think you have to identify your definition of power. Do you mean speed or knockdown power? A .177 caliber pellet will travel faster than a .22 caliber pellet but a .22 pellet will have more knockdown power. With 200 GDP ($324) you should be able to find what you are looking for. I suggest you look at the web site below and read the owner reviews. Then you will have more information about your selection.( See the related link below)If this rifle is avalable in the UK then this one has the most power I've seen in an air rifle that is not a PCP class rifle. Its the "Benjamin Trail NP XL 725" its a 25 caliber Nitro piston air rifle.
Is bullet knockdown power only related to velocity irregardless of weight and caliber?
No. The size-weight of the bullet also affects the knockdown power. Power, kinetic energy, force and momentum: they are all related, and each one carries a 'mass' component. It is, more expressly. the size of the Force or momentum of a moving object that determines its affect on other objects; and force and momentum are directly determined by both - the speed of the moving object and the size of its mass. As it requires a greater force to move the larger bullet in the first place, which therefore means greater energy expended to do so, so at the other end that greater energy is conserved in the larger bullet, and therefore hits its target with greater force and energy.
What is the difference between a 40 caliber and 50 caliber bullet?
Size and relative power. A .40 caliber bullet is .40 of an inch and the entire cartridge is 28.8 millimeters long. A .50 caliber (handgun) bullet is .50 of an inch and the entire cartridge is 40.99 millimeters long. The .50 caliber has more powder, more velocity, and more muzzle energy.
What is the difference between a 9mm bullet and a 45 cal bullet?
The main difference between a 9mm and a .45 caliber bullet is the diameter. A 9mm bullet has a diameter of 9 millimeters, while a .45 caliber bullet has a diameter of .45 inches. The .45 caliber bullet is larger and generally heavier than the 9mm bullet, resulting in differences in recoil, speed, and stopping power.
Which is more powerful knock down power 9mm or 40cal?
The .40 caliber typically has greater knockdown power than the 9mm due to its larger bullet diameter and heavier weight, resulting in more energy transfer upon impact. While the 9mm is effective and has less recoil, allowing for faster follow-up shots, the .40 caliber is often preferred for its stopping power in self-defense situations. However, the effectiveness of either caliber can also depend on factors like bullet design and shot placement.
What the difference between process piping and power piping?
What the difference between process piping and power piping?
What is the knock down power on a 12 gauge shotgun?
The knock down power of a 12 gauge shotgun depends on the ammo used. Using bird shot it had low knockdown power, however using double or triple ought buck packs quite a lot more. A slug would have even more knockdown power.
Is a 22 or 177 cal better for hunting?
The .22 is a larger slug and will have more knockdown power than the .177.
What as the most power a gas or pcp rifle?
Many people misunderstand power verses speed. Lightweight pellets can obtain incredible speed well over 1200 FPS, but that doesn't equate to power. The larger the pellet the slower the speed, but it will have more knockdown impact and will fly straighter than a lightweight pellet that is more effected by crosswind. At present the most powerful air rifle is a 50 caliber PCP like the SAM YANG Dragon Claw or any 50 caliber PCP. See the link below. It is more common to find a .25 Caliber like the Marauder or Condor with a .25 cal barrel. Benjamin even makes a new 357 caliber for hunting.
What fx airgun should you get?
This all depends on your needs. FXAIRGUNS makes 10 different models in both .177 and .22 caliber. The .177 will be faster but the .22 will have more knockdown power. So it's really up to you, your needs and the cost. Remember, there is an additional cost of the hand pump or C02 tank.
