IF you can attach your rifle firmly to your shooting rest or IF you have a helper-Hold on a target and fire one shot. Then place the reticle back on the target and, IF the rifle is stable and will not move, move the turrets to place the reticle on the hole made by the shot. Several IF's here but it does work for one shot zeroing.Otherwise, 4 (or 8 depending on scope specs) clicks equals 1 inch at 100 yards equals 1/2 inch at 50 yards equals 1/4 inch at 25 yards equals 1/8 inch at 12.5 yards.
...Also bear in mind, that unless you have a really nice scope, it's unlikely that the clicks are actually going to be precisely what the estimate says as well. I think doing it like above helps you get into the ball park quick enough. So use 3 clicks to get into the ball park, check your POI and POA difference ( high or low ) and then move up 1 click +/- at a time until you have the POI as close to your POA as possible. The sad fact is you won't ALWAYS be able to get a precise zero.
This is what I do...1 click = 1/4" at 100 yards1 click = 1/8" at 50 yards1 click = 1/16" at 25 yardsMathematically, this may seem like imprecise numbers, but think about the size of your pellet and these measurement differences. 1/8" is already .125", so it's going to be smaller than the diameter of your pellet. At 35 yards and using 1/8" per click, you really don't have enough precision to fine tune it within your pellet diameter per-click anyway, so worrying about the precise math isn't really needed.Also bear in mind, that unless you have a really nice scope, it's unlikely that the clicks are actually going to be precisely what the estimate says as well. I think doing it like above helps you get into the ball park quick enough. So use 3 clicks to get into the ball park, check your POI and POA difference ( high or low ) and then move up 1 click +/- at a time until you have the POI as close to your POA as possible. The sad fact is you won't ALWAYS be able to get a precise zero.