To practice combat, the closest you will likely get to it is through paintball, because there you are actually shooting at others and you at others. It is still far from reality though due to the fact that you can literally see the paintballs coming at you and the range limitations inherent with the "sport".
As far as practicing under pressure, there are many other ways which you can achieve a result similar or better than competition shooting. I simply think that regulated matches are not a requirement for "serious shooting". I by no means think the activity is useless and have been looking into getting into it myself.
My apologies for the thread-jack
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