Hi as above I've got groups just under an inch at 100, occasionally one close to a 1/2" comes along. You might try using a bean bag under the butt if your not already. A higher mag scope might help you at the 100yd mark.
Neil
Yep I've got the ranger for spotting. Btw they do not come ready to stick on the end of a scope without some quite tricky diy which would probably muller your warranty. The chap who done it is on the airgun bbs forum where more info is available. Excellent unit for spotting stuff without having to raise the rifle and can be used in daylight as its ccd technology. and not an nv tube so to speak.
Not perfect but with reach forward mounts but its pretty good. Remember no eye relief is needed with this so your eye is right into the the eyecup on the nv unit. No good if your using cf though, but long eye relief models are available.