Turn v no-turn data

[normmatzen]

Does any one have documented data on evidence of accuracy of no-turn 6BR/6BRX cases vs turned cases?

 

[lrgoodger]

Not on accuracy (which is outstanding), but the first box I loaded up from new cases moved the needle on the runout gauge three thousandths (I guess that's 1.5 thou runout) on almost every round. I turned the next box just enough to clean up the necks to uniform thickness (they only varied about half a thou) and the runout was cut in half. Now after being fired twice, runout is almost non-existent on rounds loaded with the turned necks. I was amazed. The needle barely wiggles on every round.

Oh, before someone asks, I'm partial neck sizing only with a thin washer over the case using a Lee collet die and seating with a Wilson micrometer seater and an arbor press. The fireformed cases fit so snugly in the Wilson I have to use the tip of a jeweler's screwdriver to pull it out.