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I agree with most of the above statement.
Except that other than shooting metal plates in matches "knockdown" power has no relevance regarding the effectiveness of a pistol round.
This has been decided & taught by the training community for decades now.
Here is a quote from Mas Ayoob re: the myth of knockdown power:
ook
well while a pistol may not provide near the shock that a rifle round does , the point is that it still hurts!
anything that hurts produces a uncomfortable feeling to the nerves/brain.
so to say that a pistol projectile that transfers pain to the target makes no difference in effectiveness is simply untrue.
it don't matter if someone is throwing rocks at you if they hit you then it hurts and effects the body.
plus not many carry a rifle/shotgun in a IWB holster. this is an old argument that pistol cartridges don't matter.
I am guessing that I have seen in the vicinity of about 400-500 gun shot victims by the way and in actual shooting scenes, not just read about the effect that gun shots have on a body.
any energy transfer usually effects how the body/mind operates.
again Knock Down power can not be measured accurately.