Jake, do you stab yourself in the abdomen or break one of your arms, so you can practice shooting after an assailant has injured you?
If not, then I also wouldn't deliberately damage your ears, for practice's sake.
Unfortunately, skifast, while I also ski without a helmet, there are many forum members who can tell you that even one or two shots, in an indoor environment, has resulted in hearing damage that has lasted from days, to permanence.
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