Do I need to re-zero my rifle when switching from my TTC calibrated for 500 ft. above sea level to the one calibrated for 7000 ft.?
You should always re-zero a rifle when time and conditions permit. However, if you follow the recommended advice, you may only have to re-zero your rifle one more time. For example, your rifle is currently zeroed for your home range (500ft. above sea level @ 70ﾺ F). Make sure that you are dialed in at 100 yds and remove your low altitude calibrated TTC. Mount the one calibrated for high altitude setting it at 100yds. Shoot your rifle at a target placed at 100yds when you are at or close to the 7000 ft. altitude. Example: You determine that the center of your 3-5 shot group is now ﾽ in. higher at 100yds. Rotate the knob two clicks (@1/4 in. per click) down (decrease yardage). Loosen the setscrews, reset your TTC to 100yds, and then tighten down the setscrews. Now you are zeroed for the hunt with the proper calibrated TTC. TTC knob swapping is always done dialed in at 100yds regardless of your zero range. At the end of the hunt or when you get home you simply remount your low altitude kn
