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No. Just that they work for shotguns. Mine work fine with the shotgun. I think it is the difference in noise profile. While both go BANG, a shotgun has a more rounded WHoompf sound where a rifle has...

I found that at the range with the bigger cals (308 /303/ mosin) I take the Howards off and use Peltor as for some reason they lift a bit with the air wave and let teh sound in. Lighter cals and no...

I will find out what ones my brother uses. I use Howard Leights but his are much better again. But his were also quite a bit dearer.....