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mreavis wrote:The only thing that matters for "knock down" is foot pounds of force. Look up a .40cal, a +p+ 9mm, and a 45 +p. As I agreed with originally, because of the 45s slightly larger size and weight yes it has the highest amount. But its minimal at best.

The thing you mention about the car vs the truck is correct. What it really also proves is something the size of a quarter does not have the cubic area to spread force evenly over someones body causing there center of balance to fail. You can't spread force like that with something so small.

To put it simply, none of those 3 calibers are a big enough object to spread that amount of force evenly over your body. All of the force hits one small spot. Now imagine if a square foot piece of tile hit someone flat in the chest with the same amount of force. There will be a lot less penetration and a lot more force spread over the body, instead of into the body.

Never was trying to argue that any round is SO much better than the other. Actually quite the opposite, they are very similar for the most part. And none of the have the energy to knock a person over by force. By shock? By disability? By fear? Yes.

Newtons Law: For every action there is an equal and opposite reaction.

You don't fall over when you shoot it..... (given there is a little variation, but that is 90% still true)

mreavis wrote:
That being said, out of a 9mm, 45acp, and a 40 caliber. The worst round you could get is the .40. The .40 caliber has a set maximum effective loading stat. This is why there are no variations in powered behind that bullet. The 9mm and 45acp have what is called +P or even +P+ loadings. Since there are different grain weights of bullets, and different loadings of powder for the 9mm and 45acp, they both are capable of hitting the same statistics of each other.