yes..why are you running the expander back thru the case >>
mike in co
The expander has to be run through the case to expand it initially. The subsequent sizeing and expanding is being done this way because I found a long time ago running the expander
IN a already sized case mouth seemed not to induce runout, where as expanding by pulling the expander
OUT of a case mouth while resizing more often left some cases crooked. The case is sized with the expander stem removed, then followed with it re-installed and case run just enough to pass the button through the neck, no sizing done on this pass.
I did try just resizing as one normally would and the brass ended up with a lot of RO to start then changed to this trying to see if it would help. This is a std RCBS die that I have not a benchrest or custom die.
I started by rounding the new brass necks with a 223 sizer followed by the 6mm expander. Load shoot and then size all fired brass with a 6x45 die minus the expander and follow up running the expander only enought in the mouths to reopen them to the right ID and load as normal from there.
I only expand as a second step with dies/brass that seems to want to show runout to begin with. Most of the time I use them as they are designed, all in one step. I did try to use the die with the expander "loose" and it was centered before I used it when I 1st tried it so I don`t think it was crooked and the problem
I do not use an expander. Use Bullseye and a wax plug and fireform. Do not use a bullet.
This may work for the initial expanding but, after fireing I will still need to size and expand the cases unless I drop $$ on a new bushing die or have Lee make a custom collet die which I`m not to eager to do yet.
What difference does it make if a bullet or plug is used or Bullseye or 4895? Both rely on pressure to expand the case and I`m getting the cases blown out with no measurable runout by simply using my initial development loads.
Fireing a loaded round that shows runout from expanding the new brass leaves a perfect fired case, the damage appears again though in the next sizeing/expanding process to leave the case mouth ready for seating a bullet. As I said I`m pretty sure the brass wall is uneven and stretching more on the thin side then the thick or warping in one direction or the other due to it.
The new brass isn`t too bad for cheap factory prior to me messing with it. The initial pass through a 223 die to round out the mouths leaves very straight 223 cases to start with, it is the pass with the 6mm expander that screws them up, 1st and every time
I`ve never sized up on a case before, just necked down, and had acceptible results on the couple I did that way. At the moment I`m leaning toward turning after the 1st fireing/expanding and see if that helps. I am just afraid the amount of runout showing will mean taking more off then I want and not leaving enough case wall to hold a bullet properly without a custom sizer, or cause other problems.
If it was just one brand of 223 brass I blame it. This is occuring with two different brands of parent brass