What kind of scopes are people using on these? I am assuming a rifle scope....Is competition freehand or bench OR both? I dont know anything about IHMSA...I just like this barrel..I couldnt beleive how accurate this little thing is with irons, so I figured I would try it with a scope. So far, I have only put a 2x on it, but it seems that it would be very accurate with a high-power rifle scope. Somebody fill me in please.