I went over an played some more and oversized a few more of those old cases.
Bear in mind that the dies are 7/8 -14 thread so that is just over .007 travel for one full rotation.
I started with the die just contacting the shell holder. Sizing was a predictable 1.623. Another 1/4 turn and it was 1.119 with a cam over effect, 1/2 turn and I got 1.615 and a cam over, 3/4 turn no cam over and measurement between 1.615 and 1.613
My final theory is that when not camming over the resistance of the case is overcoming any play in the linkage pins keeping the shellholder from contacting the die and by the time you get to 3/4 turn the ram linkage has overcame the case resistance.
Anyone have any other theories? There is no slop in the die threads once the locknut is tightened and cast iron is not known for it's flexibility. You are not going to compress steel so that rules that out.
On the linkage theory grab the linkage and you can deflect it laterally and vertically a few thousandths . It is designed with some play in the pins so that it rotates smoothly without binding. That my friends is where I believe the cam over ghost hides which is what I suspected for years but never stopped to take time to investigate
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“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek
Last edited by hounddawg; January 11, 2019 at 06:24 PM.
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