I have a 4" S&W M66 too and it's my usual concealed carry weapon. When afield I pretty much always have a gun but don't always carry a pistol. When camping (and when I do carry a pistol hunting) I usually have with me a good ol' Ruger BH in 45 LC carried cross draw, out of the way. I take it because I don't mind beating it up a little here and there...it takes a lickin' and keeps on tickin'.
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Mike