IMHO, unless you are competition shooter or you are trying to drive tacks at 400yds, you are not going to notice any difference between a 1/9 and a 1/7 twist. Here's a pic I took this weekend. I was shooting 55gr Tullammo thru my 1-7 twist barrel at 220 yards using a cheap Tasco Red Dot. That is a 9" diameter paper plate I used for a target, held by tacks at top and bottom, but for some reason the pic posted sideways. I couldn't do any better using the 1-9 twist barrel with the same ammo, and couldn't do any better with the 75gr BTHP Hornady Black that I shot also. When I get a good scope, I might be able to improve, but for now, at the distances I'm shooting, I can't see any difference between the 1-7 and 1-9.