bullet velocity increasing beyond the muzzle??????

[Dan-o]

So, my kid bought some pistol ammo and the velocity chart says it's traveling 60 FPS faster at 25 yards than at the muzzle.

That makes no sense to me.

I don't believe it.

Anyone care to try to change my mind?

[JimmyHoffa]

Some major muzzle blast to do that. 

[Dan-o]

I've looked at the box 10 times.

I'll have to take a pic and post it.

[JimmyHoffa]

Shooting downhill in a vacuum?

[Bob33]

I don't believe it. Probably a typo.

[Alchase]

I could see in a "longer barrel" as opposed to a shorter barrel, allowing all the powder to burn to it's peak efficiency. But that is a matter of a couple inches, not 60 ft.
I an't find any reference to a bullet continuing to accelerate after leaving the barrel.
There would be nothing pushing it.

[jasnt]

Seen this posted before.  Typo

[bobcat]

Impossible. Against the laws of physics.

[huntnfmly]

Layman here so forgive my ignorance but if a certain amount of powder was capable of pushing a bullet to X amount of speed wouldn't the bullet speed up a little once it escaped the friction of the barrel?

[b23]

Once the bullet leaves the barrel it starts decreasing in velocity.  Even just a few feet out and it's measurable. 

Way back when the first Magnetospeed Chronographs came out I bought one, but with them being such a new item there wasn't any feedback on them yet and not knowing how reliable they were I shot mine inline with my dad's Oehler 35P because I knew they gave accurate readings.  Consistently, the Magnetospeed, taking its readings right at the muzzle, would give higher velocities of 10-20fps, depending on the gun/bullet than the Oehler did with the sky screens set 12-15ft away from the muzzle.  I loaned my MS chronograph to a friend in MT that also had a Oehler 35P and his results mirrored mine.

[jasnt]

Layman here so forgive my ignorance but if a certain amount of powder was capable of pushing a bullet to X amount of speed wouldn't the bullet speed up a little once it escaped the friction of the barrel?

the friction of the barrel is nothing compared to the preasure behind the bullet. The moment the preasure behind the bullet is lost( exiting the barrel) the bullet begins to slow due to the friction of air.

[huntnfmly]

Layman here so forgive my ignorance but if a certain amount of powder was capable of pushing a bullet to X amount of speed wouldn't the bullet speed up a little once it escaped the friction of the barrel?

the friction of the barrel is nothing compared to the preasure behind the bullet. The moment the preasure behind the bullet is lost( exiting the barrel) the bullet begins to slow due to the friction of air.

Thank you for that

[Magnum_Willys]

Force = acceleration. Though the pressure ( force ) rapidly decreases past the muzzle there is still significant force there for a bit ( hence muzzle blast).  This force will continue accelerating the bullet until the air resistance force exceeds muzzle blast force.  Distance depends on velocity and bullet shape. 

[Bill W]

the gyrojet increased in velocity after leaving the barrel.

[Alchase]

Force = acceleration. Though the pressure ( force ) rapidly decreases past the muzzle there is still significant force there for a bit ( hence muzzle blast).  This force will continue accelerating the bullet until the air resistance force exceeds muzzle blast force.  Distance depends on velocity and bullet shape. 

Except that while in the barrel all that "force" is behind the bullet pushing it. Once the bullet is out of the barrel, the "force" is no longer contained behind the bullet and loses that energy out in all directions, no longer supplying the same amount of "force" required to maintain velocity. A bullet or any projectile has to have a maintained "force" behind it, just to maintain speed let alone increase velocity.

As Bobcat said

Impossible. Against the laws of physics.

And as Jasnt said

the friction of the barrel is nothing compared to the preasure behind the bullet. The moment the preasure behind the bullet is lost( exiting the barrel) the bullet begins to slow due to the friction of air.

Based on science. 

I slept a Holiday Inn Express last night