The more I see people shoot.... the more I'm convinced a competent shooter with a big game rifle is rare.
A guide can do something to protect their hearing.... they can't do anything about schitty shooting. I tend to lean toward making sure bullets go the right place.... the rest of it can be worked out.
For the record.... I hate brakes.... it's not my ears they hurt, it's my face. Shooting big braked rifles will give me gnarly sinus headaches.... due to the pressure wave impacting the mastoid cavity. This can also damage hearing.... even with plugs and muffs on.
