Thanks Stug, very interesting. The trick of having the stem taken up to use the die to guide the neck onto the expander is new to me.
Rotating the case 180 degrees at least once when the neck is first engaging the die does seems to make a marked improvement in concentricity when using regular dies. Never tried indexing for a rifle chamber though.
Kirby's comment on the Redding dies is also true - the bushing ones (but without the inline sleeve) won't necessarily produce better concentricity as the case is still unsupported. Yesterday I tried everything to improve this in once fired Lapua cases using a Type-S die but am still introducing 0.003" into perfectly concentric fired cases, and I'm only trying to size the diameter down by 0.006" ! Getting to the point now where any OCD sufferer advice will be given serious consideration.
Bookmarks