IMHO custom molded earplugs are not worth the money. My wife & I have used the disposable foam plugs for years, both the yellow type & currently the Howard Leight pink version w a 30 DB rating.

Several years ago my wife wanted to try a set of custom molded ear plugs & I tried to talk her out of them but she insisted.

$$ later she wore the custom molded plugs (INSTAMOLD) about 2 rounds of sporting clays & went back to the disposable foam because of better noise reduction w/ the disposable foam.

I think the problem w/ the the custom molded plugs is that the material used is too dense & doesn't attenuate the noise as well as the less dense disposable type.