Tested my 3x Gene Davis booster on a Weaver 36 yesterday. It does work well at 100 and 200, but at 300 and beyond I could not see bullet holes. Removed the optical booster, and they were clearly observed without it. The reticule is very slightly larger, but I do not think that is a problem. The booster is probably fine for short range BR competition, but not for my use in groundhog matches out to 5ooM.