I went to an audiologist, had them do a hearing test - and for $100, they did the test and did a mold of my ear canal, and custom made ear plugs, with a removable circular sections that you can specify how many DBs you want hearing protection for. I usually use my 25 to 30DB reducers. I use these when I hunt and they have suited me well. Might be worth looking into. Because they are custom to you, they fit better and allow for better overall protection.
"Keep your aim as true as your word" - GB