Machineguntony, if you simply wear a motorcycle helmet as is, with plugs on underneath, you will already get a huge amount of sound dampening. Modern helmets are designed with acoustics in mind and help to quiet down road/wind noise a lot. Granted they are not generally designed with shock-wave supression in mind. Just not sure how much more real sound de-amplification you would get with separate materials in the same format. Most of sound/acoustic suppression comes from dense/layered materials with air gaps. It's all about isolation, but also weight. You would basically have to have a booth to completely eliminate sound from your left and right and you would still get reflection from downrange unless there was some sort of "porthole" affair to shoot through.
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