@UncleNick…have you validated the math in that pdf. I must admit, it has me confused as it is defining TIR as 1/2 of the max swing of the indicator plus 1/2 of the bullet diameter. or basically centerline to max distance from the centerline.
The, why is TIR shown in mils(angular measurement) and inch(linear measurement)?
Then B and C are based on a bend point, but In the real world, the bend point is unknown, right?
That said, knowing C the measurement point, TIR and a few cartridge dimensions, I and use basic trig to calculate a bullet tilt angle for the Hornady system.
I can also do the same with the cantilevered system.
That said, if I want to know how far my tip is from the centerline, I can just mease with the std tool like Accuracy One, RCBS and 21st Century tool do. I would contend that folks who make the Hornady style tool want smaller variation numbers so the user thinks they have higher precision. Which is false. It is just a less detectable measurement, where we actually want a more detectable measurement.
Unclenick said:
The only reason I know of for having an expander in bushing dies is if you are using a self-loader and get dented case mouths either from the case spinning and hitting the gun during ejection or from hitting the ground afterward.
IME, when I run bushings without an expander, the neck curls inward. On something like the Hornady, I just spin the expander in a drill to turn down if required. I wonder if Hornady sells custom diameters?? I’m calling today!