Bullet speed?

Question

Does the speed of bullet the same before and after leaving the barrel? I always think it's the same.

I mean just after leaving the barrel.

Hm, I just want to know is there speed difference just before leaving the barrel and just after leaving the barrel?Does the "bang" sound increase the speed of bullet?Because one of my friends insists that it increase.I am aware that bullet has no engine to boost the speed by itself.

Answer 1

Bullet speed decreases, however it takes several hundred yards for a discernible difference, i.e. one that produces a notably different effect on target.

Answer 2

There can be a difference. However there are a lot of variables. For instance powders burn at different rates and barrels are of different lengths. If a powder is a slow burning one and the barrel is short, the bullet will most likely leave the barrel before all the powder is burned. This tends to create significant muzzle blast and muzzle flash. It is inefficient in terms of generating muzzle velocity.

On the other hand if powder burns quickly and the bullet is still in the barrel after the powder is all burned, then the friction of the barrel will slow down the bullet before it leaves the barrel.

Load/gun combinations that have significant muzzle blast are not all that fun to shoot and the powerful gasses can disrupt the stability of the bullet as it leave the barrel and thereby diminishing accuracy.

Good luck

Answer 3

the bullet will accelorate untill just after it leaves the barrel. it only stops accelorating when the bullet is far enough away that it is moving faster than the gases behind it. most likely this is around an inch or two, depending on the ballistics of the ammo, and length of the barrel. with a very long barrel, and an underpowered cartridge, the bullet will actually be slower as it is leaving the barrel, compared to an inch or so before the muzzle. i believe some .22 rounds are made with just a primer(no propellant) for this purpose. it would make the gun much quieter, and more accurate.

in an ideal situation, the bullet will stop accelorating as it leaves the barrel. the pressure behind the bullet often will cause it to be less acurate if it continues to push it once it is out of the barrel, and the bullet has nothing to stabalize it. some barrels have ports, or a compensater/muzzle break to release this pressure before the bullet exits the barrel.

Answer 4

Bullets speed up in the barrel and start slowing down as soon as they leave the barrel. I've been reloading my own bullets for almost 30 years and have 32 guns and a cronograph i use to check the speed of my bullets.

Answer 5

Muzzle velocity ( the speed at which the bullet leaves the barrel) is the fastest that bullet will travel, It only looses speed and energy from that point on.

Depending on the caliber some lose speed and energy very quickly

For instance 7.62 X 39mm (AK47 bullets)

7.62x39MM Muzzle 100yds 200yds 300yds 400yds
Velocity(fps) 2300 2030 1780 1560 1360
Energy(ft-lbs) 1455 1135 875 670 510

Answer 6

ok this i know... i am an aerospace engineer dont u know... the bullet speed is not the same, if you think about it it will alwasy decrease, because if you say bullet speed is the same before and after it leaves the barrel then it will keep going on forever, as there will be no momentum loss.

Essentially you there are two things slowing ur bullet down one is air resistant and second is gravity, this si why whne you through you football it falls if no one is there to catch it...the distance that the football or the bullet travel depends on the force that has been acted on it. In case of a bullet this force is generated by the the chemical reaction from the gunpowder and the shell.

make sence

J

Answer 7

Betchadidn'tknowthis! There once was a pistol called the "GyroJet". It shot a caseless ammo that used primer fired rocket propellant and fired a 12 or 13mm (.50 and .51 caliber) spin stabilized rocket projectile that accelerated to 1,250 fps in .12 seconds of leaving the barrel! They were made from 1966 to 1969. They didn't sell many and are seldom seen in regular gun stores. What little ammo remains sell for $20.00 or more each and are as rare or more so as the pistol.

Answer 8

You are incorrect my little dwarf. There is a heck of a lot of combustion behind the bullet in the barrel due to the powder burn. However, there isn't any outside your barrel.

Answer 9

when the bullet is in the barrel , it is subjected to the high-confined pressure of burnt gunpowder and accelerates along the muzzle , till just leaving the muzzle , the confined pressure dissipates in air and bullet acceleration stops , then bullet starts moving under its momentum only , subjected to air resistance(decreases speed) and gravity forces(change direction vertically downwards) to take the resultant parabola pathway.

Answer 10

Hey................can....can...can....I be the rocket scientist? I know this one too, J is right.