Originally Posted by davkrat
They were greater than .306" which is obviously too loose. I'm thinking even the cases that do hold the bullets are probably just barely tight enough. Is there a better way to measure neck inside diameter than using dial calipers? It seems difficult to get perfectly centered in the neck and get a consistent measurement.
I'm going to get a bushing die and put more tension on them. I had wondered if the monolithic nature of the Etip required them to be on the smaller side diameter wise to avoid pressure spikes.
Calipers should be adequate. But, you may need to practice your technique to get repeatable readings.
Did you get .306" after using the sizer+expander? Or, just the sizer with no expander?
Your sizer die alone should surely take it down below .306" (unless the necks are extra thin). Then, the expander should expand it back to some reasonable diameter. If the sizer doesn't neck the cases to something less than .306", then you may need new dies. Otherwise, your expander is too large and just needs to be sanded/polished down in a drill chuck.
Otherwise, there's something not right with your brass i.e. too thin, or work hardened.