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# Terminal Balistics

#15
04-19-2008, 05:05 PM
 Platinum Member Join Date: Feb 2005 Location: USA Posts: 2,599
Meplat diameter is critical to wound channels in handguns and The Large Flat Point Hard Cast are very effective as the following picture will Illistrate

Pig taken with 454 with a Flat point Hard Cast at about at an Advertised 1400 FPS (not chrono'ed)

The leg pulled off during skinning Impressive damage IMHO

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range it,check the wind, dial in correction, aim and only one shot
#16
04-19-2008, 05:20 PM
 Silver Member Join Date: Jan 2008 Location: Elko, NV Posts: 462
Quote:
 Originally Posted by jwp475 The handgun rounds demonstrate the inaccuracy of FPE as the sole determining factor...
No one ever said it was. It's one of many factors.
#17
04-19-2008, 05:27 PM
 Platinum Member Join Date: Feb 2005 Location: USA Posts: 2,599
Quote:
 Originally Posted by pstimac No one ever said it was. It's one of many factors.

Agreed.........
With out the kinetic energy we would not have an accelerating force for the projectile....
__________________
range it,check the wind, dial in correction, aim and only one shot
#18
04-20-2008, 05:34 AM
 Junior Member Join Date: Apr 2008 Location: Germany Posts: 5
Momentum vs. Energy...:

Lets say we have two calibers
(numbers chosen for simple calculation)
1. a 'Solid' with m = 20g and v= 500m/s
2. a 'Solid' with m = 15g and v= 1000m/s

For simplicity we assume that both bullets have same diameter and will not deform in target...

We now shoot both calibers at a target in which 1. will stop on the far side skin, which means that it will loose all momentum and energy to the target.
2. will ofcourse produce exit wound and will fly on, loosing only part of its momentum and energy to the target... lets say it will exit with 700m/s...

Now we add up momentum and energy:
Before target
1. has 10Ns momentum and 2500J energy
2. has 15Ns momentum and 7500J energy

After target
1. has 0Ns and 0J
2. has 10,5Ns and 3675J

Because momentum and energy are lost to the target we get for
1. 10Ns and 2500J lost in target...
2. 4,5Ns and 3825J lost in target...

(btw to just get the same momentum lost to target 2. has to be slowed down to 333m/s... on the way it will loose 6670J to the target...)

With some common sense and practical experience one would say that 2. will make the most damage by far and kill better...
This is true for the energy lost to target - 2. lost 1325J more to the target...
It is completly false for momentum because 1. lost more than double (5,5Ns more) to the target and if momentum would mean damage to target it would mean that the wounds of 1. would be much server (double?) than of 2. ...

The trick with the better 'killing power' of the slow/heavy bullet compared to the fast/light bullet is, that the mass will penetrated deeper into the target and can reach the area were it most hurts, while the small bullet will not penetrated as deep because its deformation and mass will not allow it...
Its energy is lost where it is not so lethal...

But if you take a say .500SW which kills a bull better than a .243 because of penetration a .50BMG will kill it even better even when it not lost as much momentum as the .500SW... the total energy lost to the target will be (very) higher... resulting in server wounding...

And when momentum could kill a deer it would kill the shooter before the deer because the shooter gets hit by the same momentum as the deer through the recoil...
Actualy he gets even more momentum than the deer...
For one the bullet will loose momentum in flight to target and while the rifle will be completly stopped by the shooter (transfer all momentum to shoot) the bullet will exit the deer taking with it not lost momentum...

Velocity and bullet typ is all you need...
And while you can always go up in speed you can not have the super expanding super penetrator (yet)... You will allways have to choose the right kind of bullet for the target and speed...
#19
04-20-2008, 03:14 PM
 Platinum Member Join Date: Mar 2007 Location: Montana Posts: 1,325
Creating the largest wound channel is what does the killing. How the bullet reacts to the impact is the key to creating the wound channel. Square fronted non-mushrooming solids create the largest wound channel because they displace tissue perpendicular to the bullet's path, and penetrate fully, because there is no loss of mass, or increase in diameter.

So it seems that the bullet that retains the most velocity after impact and deforms in such a way that it displaces tissue perpendicular to it's path is what we are after.

I agree with an earlier statement that more or less said there is no such thing as knock down power. If there was it would knock down the shooter 1st.

Now the trick is to pick the bullet that will be stable in flight, fully penetrate and create the wound channel proportionately large enough to kill the size of the game animal being shot.

What it comes down to for me is what part of the dangerous game solid do I
want to compromise in order to hunt further down range?

This stuff is hard for me to figure out, because for the sake of the animal, I don't want to figure it out by trial and error.

Steve
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To hunt... or not to hunt...? What a stupid question.

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