I finally got my butt in gear and bought that dial caliper.... Now to figure out how to make an adjustable mount that is rigid and repeatable.... Bob
Just to put some numbers on this.... If we look at a BC of 0.14 at 900 fps.... sighted at 100 yards.... It takes about 400 MOA to get to 1000 yards, and about 125 MOA to get to 500 yards.... That means that 0.40" on the dial caliper would be enough for that combination (or 1/8" for 500 yards).... Note that the bell of the scope would drop 2-3 times that far (depending on the position relative to the pivot, so you would need the scope mounted very high up.... A Condor would therefore be a good candidate.... If you mounted the adjustment wheel further from the pivot (let's say at about 5") so it was behind the dial, you would need more travel.... If the Bellevilles were sitting on the adjustment screw, you might need about 0.6" of travel on them, more if you wanted decent pressure when at maximum height.... That isn't possible with Bellevilles without a hugely tall stack of them.... They typically only have a travel of 0.020" each, so an inch of travel would need a stack of 50 of them (about 3" tall).... .... A coil spring has the same problem, to get a lot of force and a lot of travel needs a long spring.... So, we probably need a locking mechanism, rather than a spring, unless you only want, say, 100 MOA of adjustment (which would limit you to about 400 yards with a good slug)....If the adjusting screw was 20 TPI, each turn would be 50 MOA if it was 3.438" behind the pivot.... 8 turns for 400 MOA.... There are some significant design challenges, particularly if you want to be able to dial up really long distances....Bob