Today I did some scope tracking with my Zeiss HD-5. I forgot my target but luckily someone left a half sheet of OSB in the desert for me to shoot at. I did have problems keeping it upright when the wind started blowing though. Also I didn't have a line to line the crosshairs up with to shoot the upper groups so I tried to use the upper bullet holes the best I could. What I did was shoot one shot at the low target and then do a full rotation on the dial and shot the next. Then I went back down and shot the next and back up, etc. for 15 shots at each elevation. If you throw out the 3 shots I pulled to the right on the lower target the other 12 would be under an 1" and if you throw out the two shots I pulled off each side of the upper group it would be under 1" for 13 shots. It also didn't help having a terrible mirage today. Usually I shoot earlier in the day but I hung out with the family instead. This was with my 6.5x47 Lapua and 123 Amax's over 41grs of IMR4350. I'd say it tracks pretty well.