depends on what i am shooting, as well as distances
when shooting sporting clays, i NEVER NEVER NEVER look at my sights. (i guess that goes for all of my bird hunting.)
i shoot decently, ranging from mid 70's to high 80's most of the time.
handguns, it really depends on the distance.
the trick to shooting with this method is consistency.
hold the gun in question exactly the same way, every single time you fire it.
the second trick is practice!!!
i will sit in my house and practice my grip, as well as practice bringing the handgun up and aiming at certain objects. i will focus on the object for a number of seconds, then while continuing to focus on the object, will bring the handgun up to aiming point. i will not move the gun for several seconds before checking where my aimpoint is.
I have been known to do this for several hours.
practice, even when you are not at the range, makes perfect.
and, as mel gibson said in The Patriot, "Aim small, miss small"