I've been shooting over 40 years, and this little snippet of information from accurateshooter.com ( https://www.accurateshooter.com/optics/determining-scope-height-above-bore/ )has some of the best information IMO about how to calculate the center of the bore to the center of the scope line of sight. This value is needed to order custom elevation turrets for the high end scopes that are out these days. What a lifesaver. I've been eyeballing a ruler on the side of a scoped rifle for years.
1. Measure the bolt diameter and divide it in half. Example: 0.700″/ 2 = 0.350″
2. Measure the scope tube diameter and divide it in half. Example: 1.000″ / 2 = 0.500″
(Note: for 30mm tubes use 1.181”)
3. Measure the distance from the top of the bolt in the rifle to the bottom of the scope on the rifle. Example: 0.750″
4. Add the numbers found in the formulas in steps 1-3
Example: (0.350″ + 0.500″ + 0.750″= 1.600″)
1. Measure the bolt diameter and divide it in half. Example: 0.700″/ 2 = 0.350″
2. Measure the scope tube diameter and divide it in half. Example: 1.000″ / 2 = 0.500″
(Note: for 30mm tubes use 1.181”)
3. Measure the distance from the top of the bolt in the rifle to the bottom of the scope on the rifle. Example: 0.750″
4. Add the numbers found in the formulas in steps 1-3
Example: (0.350″ + 0.500″ + 0.750″= 1.600″)
