What this means in this context is that if the .40 is more powerful, it will have more recoil - simple phisics. To try to fault a cartridge for having both too much recoil and too little power shows a lack of understanding. Education today is clearly lacking.

To say something is obsolete implies there is something else that gives equal or better results faster, cheaper, etc. and that something else is both more widely distributed and accepted. What pistol cartridge is more widely distributed and accepted than the .357 magnum?

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Big bang, much smash'em.