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As already said I am sure, it’s the best gun that you can use accurately. Remember when you need it, bad things will always happen, safety left on, type 1, 2, 3 malfunction, not enough ammo... ECT// you need to make sure you can use the gun you carry to the best of your ability no matter what Cal it is. Always fear the man with one gun, because you can bet he knows how to use it.

The Hatcher Formula is an attempt to mathematically evaluate the approximate effectiveness of pistol ammunition at incapacitating a person. Developed by Gen. Julian Hatcher in the 1930's, it uses the bullet momentum, frontal area, velocity, and a 'form factor.'
The formula is:
RSP = M * A * F
where RSP = Relative Stopping Power Index, M = Momentum of the bullet in foot pounds, A = Area of the bullet in square inches, F = Form factor derived from his observations with some additions for later bullet types.

Hatcher Formula
Used to decide stopping power of a pistol in SD, the best stopping power is 50 with anything going over 55 having diminishing return and more recoil

45 = 60.7
40 = 59.4
10 = 62.1
9 = 39.9
380= 18.3

Mass x Velocity = momentum

Momentum = penetration depth.


Quick list of bullet stopping power based on the formula

http://www.abaris.net/info/ballistics/hatcher-table.htm" onclick="window.open(this.href);return false;

The 9mm Luger[/url] has a higher velocity than the .45 acp from a 3 inch barrel and roughly the same muzzle energy as the .45.

The only thing the .45 has over a 9mm from a 3 inch barrel is mass, and the 9mm makes up that difference with velocity.

How about this would you rather get hit in the chest with an 80mps baseball or a 30mps 400lb bolder. The velocity of the smaller and lighter (less mass) baseball will not make up for the larger and heaver (more mass) 400lb bolder. Both can kill you, but one will have a better chance of stopping you then the other and is more lethal.