Since game animals cosist of a much denser material than air, then why bullets continue to revolve after impact, if this is true?
Lefteris.

Great, I can already see a "Fast twist vs. slow twist" arguement coming out of this one!
It's simple, because the bullet is rotating before it impacts the animal, just the impact itself is not going to completely stop the rotation, although slow it down considerably. Say if it were to stop rotating inside a animal, I would guarantee the bullet would be more apt to yawing than if the bullet has spin emparted by rifling.
It's no phenomenon or amazing feat, just the physics of a rotating projectile entering a medium which, while denser than air, still allows the much denser projectile to enter. Meeting the resistance causes the projectile to deccelerate, along with the spin, until it has either exited or come to a complete stop within the medium.

quote:

Originally posted by Lefteris Vassiliadis:
Since game animals cosist of a much denser material than air, then why bullets continue to revolve after impact, if this is true?
Lefteris.

A description what happens on impact is here:
Stabilisation in tissue

Because an object in motion tends to stay in motion. It is one of Newton's laws. The fact that the motion in question is rotary makes no difference. It is the same principle that makes gyroscopes works.

At some point in transit through the animal, the rotary motion may be slowed to a point at which the projectile becomes unstable, at which point, the projectile will tumble. If not, the projectile will penetrate through and through.

Hope that answers your questions. Kudude

There are probably brilliant experts that post here that would say I'm wrong but I don't believe that bullets "bore" through as some posts seem to indicate. I have seen some evidence of bullets stopping their rotation shortly after contact with an animal. Also, with most twists the bullet is not going to rotate more than one or one and a half times going through an animal. I'm sure that you can calculate rotational energy imparted by the rifle barrel twist on the bullet but I don't believe it's powerful enough to twist through large thick hided animals. MUFASA

Many bullets, that I have recovered from game, including Barnes X bullets, show signs of rotation durring and after expansion.

I am nowhere as experienced as some on this forum. That being said I'll throw in my .02 cents.

I haven't been able to see much/any rotation when using BTs or Partitions on deer and elk. On my cow elk last year, the recovered Barnes TSX .338 210gr looked like a Barnes ad. The four petals folded back and "twisted" as from a right hand twist barrel. I don't know if the bullet expanded and "twisted" while traveling a few inches or if it opened up and continued to "twist" for the duration. My vote is for the latter but I'm open to other thoughts.

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There are probably brilliant experts that post here

Ahhhhhh....well...errrr...that's one way to say it.....more likely a few folks so full of bullshit that they have a ball using ten dollar words to fulfill he old saying..."if you can't dazzle em with brilliance baffle them with bullshit"!

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I don't believe that bullets "bore" through as some posts seem to indicate. I have seen some evidence of bullets stopping their rotation shortly after contact with an animal.

To find out the truth, go to the Barnes website www.barnesbullets.com then click on the bar that says "Bullet Talk" and pull down the menu and check the pictures out how a bullet spin through a gelatine block. A picture is worth a thousand words.

Warrior

I count less than two turns in those gelatin blocks not five. That would be about the right number of turns for 16 inches of penetration. If the bullet has four points and each point draws its own line it can not be five turns in the block? The top block shows five lines and with four points it means just over one turn in the lenght. The second block is more difficult to count but a generous count is six lines. Divide by four points gives less than two turns?