If you are going to be using your Model 66 as a hunting and trail gun, the 6" barrel would
probably be your best bet, it does give you a little more velocity and accuracy. I have the 4"
version and I love it! My Model 66 is my nightstand gun and I use it for home defense and
target shooting. It is a tackdriver in 4" and I can imagine it would only be even better in the