Howdy everyone. I've recently got into power trimming and forming on my Dillon 1050 for 300 blackout from 5.56. The Dillon rapid trim die is the carbide and is mated with the honey badger/Bosche router. I've got the short toolhead and have tried various brass including factory 300 blackout.
I'm getting a nasty ring at the base of the case after running it up into the die (both with and without the trimmer). I can physically feel it and definitely see it. It almost looks like case head separation, but it's actually skimming and moving the brass and creating a ring. Like that base is to tight. It'll push that ring out enough that it actually even prevent the sized case from going into a Sheridan case gauge and Lyman ammo checker.
I also have a Lyman pro trim die and I don't get that issue. It sizes fine and no ring. I've also tried running my brass through a small base sizing die first which sizes fine, then when I put it into the Dillon die I get that ring at the base. Again I've tried with about 20 different headstamps and factory 300 blackout brass and get that ring only when in the Dillon carbide rapid trim die.
Anyone have or seen this issue? I saw one guy that had the issue with Dillon carbide 30-06 years ago but don't know the outcome.