@ 12:21 pm (GMT)
Estimation is fine, do it all the time. One just has to be careful that the accuracy of the internal threads is up to the task. It's kind of the same with the digital scale discussion. When the specs say +/- .1 grains, that relates to a .2 discrepancy.
The real test will be in the targets. Keep us in the loop, will be interesting to see the results.
I have a theory about the cant, but it isn't widely accepted. (People actually asked if I was "challenged"). So, I'll let someone else do that one.
What's your theory on can't, Paul? I love things that aren't widely accepted.