run out question

[Dave Roelle]

check the wall thickness about midway in the bullet bearing section of the case---------you might be surprised how much variablity exists there---coule easily be 0.001 of the total run-out you show

also check a sized but unloaded case on the od -----i found variability there due to a shell holder not well centered

after you have those two contributors to run-out nailed down start working on the degree of expansion of the case mouth-----------bullets have to have a good chance to "start straight" in the case to end up as close to 0 runout as possible

current wisdom indicates less than 0.002 TIR to get match accuracy

the numbers look pretty good except those -004's and 0.005's

i have had lube buildup in the seating punch cause difficulties if i get sloppy with the lube

Dave