1. How accurate is the level built into the Spuhr mounts? Yesterday I was using a scope fixture to level the Spuhr mount and then level the scope in the mount using a plumb bob. The fixture base was level in both directions and the picatinny rail on the fixture was level in both directions as was the flat surface between the rings on the base of the Spuhr mount. However, the level at the rear of the Spuhr base did not indicate that it was level.
To level the scope fixture, I used both a circular surface mount style level with a sensitivity of 0.035 in./ft., 10 min./0.1". I could rotate this level on the various surfaces without changing the reading of the level. I also used the "calibrated" level out of a Wheeler Professional Reticle Leveling System with the same results.
2. What is the minimum distance that it is feasible to do a tall test? I understand the standard use of 100 yards as that is also the distance that many/most people zero their rifles/scopes. However, if you are doing the test with the scope in a fixture, are there any problems with doing the test at a shorter distance with an appropriated reduced size test target? Mathematically, I cannot see why it would matter and using a shorter distance would make it easier to use a test target that is more than 10 mils tall. The only real limitation I've though of is just using a distance that is long enough to be able to adjust for parallax with the particular scope being used.
Thanks for your advice.
To level the scope fixture, I used both a circular surface mount style level with a sensitivity of 0.035 in./ft., 10 min./0.1". I could rotate this level on the various surfaces without changing the reading of the level. I also used the "calibrated" level out of a Wheeler Professional Reticle Leveling System with the same results.
2. What is the minimum distance that it is feasible to do a tall test? I understand the standard use of 100 yards as that is also the distance that many/most people zero their rifles/scopes. However, if you are doing the test with the scope in a fixture, are there any problems with doing the test at a shorter distance with an appropriated reduced size test target? Mathematically, I cannot see why it would matter and using a shorter distance would make it easier to use a test target that is more than 10 mils tall. The only real limitation I've though of is just using a distance that is long enough to be able to adjust for parallax with the particular scope being used.
Thanks for your advice.