Originally Posted by bullitt5897

LOL I did say "crazy" didnt I... I dont consider the .22mag a good self defense round at all. Also, when I was referring to knock down I am referring to the capability for a specific caliber to stop a target its not a myth and the amount of force felt by the shooter does not equal the amount of force felt by the target... that is bad physics as there is several contributing factors of why you the shooter do not feel the kick and or force of the shot... Due to the nature of the slanted slope of a bullets nose there will be an increase in the amount of pressure on that small given area. This will cause the bullet to penatrate the target better than a blunt object... Now if you use hollow points thats a whole game changer as they change shape to inflict the largest amount of dispersing energy at a given penetration depth... in other words what would have felt as a golf ball sized pain and entry wound will know feel like a softball or bigger sized pain and entry wound. A .22 will not phase someone who is pissed charging at you and a .45 will at least stop the initial charge maybe even spin the person or throw them on their butt. This is all relative to where you hit the target and the targets size/weight. Knock down power is simply the amount of Ft/Lbs the bullet carries at a given distance...

Lets take a rifle round for example...

5.56 NATO and 6.8 SPC

I have shot and tested both extensively...

5.56 Nato (Hornady 75gr Tap) *this is the best bullet to transfer the most energy*

100yds = 1090 ft-lbs
200yds = ~918 ft-lbs
300yds = 750 ft-lbs
400yds = 616 ft-lbs
500yds = 497 ft-lbs

6.8 SPC (Hornady 110gr VMax) *this is the best bullet to transfer the most energy*

100yds = 1510 ft-lbs
200yds = 1226 ft-lbs
300yds = 987 ft-lbs
400yds = 836 ft-lbs
500yds = 660 ft-lbs

As stated larger caliber bullets have a greater force at equal distance... If you need graphs I can do a comparison graph to show the difference.