GG I'm not sure how critical the sight height is to the calculator. I just use the tape and eyeball method. If you play with the scope height numbers in the calculator you can see how it effects calculations. I varied the scope height by a half inch, going a 1/4 inch low then high the 100 yard zero changes by less than 1/4 of an inch, the near and far zeros only varied by 6 or 7 yards.
The calculator worked well with standard scopes for me but using it with my Photon the numbers didn't seem to correlate. I would use the near zero to get me on paper but would always have to make elevation adjustments at 100 yards to finalize my zero.
gg, Good question. I generally use a caliper, but even then a guess. Where I can reach the bottom of the scope tube with the caliper still puts you somewhere over the receiver or chamber area of the action. So, I go from the bottom of the scope tube (that's a 1/2 inch on a 1" tube) and try to eyeball the center of the bore, or about where it should be. Generally in the 1.5 - 1.75 inch range. All of the ballistic calculators require this dimension for the calculations. I generally come pretty close. So, to answer your question, I am not one that knows, but that's how I have done it and got by. Is there a right way???
Baitpile and pmack, thank you for your response. I feel a little better knowing the sight height for calculations is not that extremely critical. I will do my best though to measure.
Another congratulations to baitpile Jr., for his take on a nice coyote.
