I cast the Accurate 40-224H for my GP100 10mm
I started sizing to to .403 (previously.402) after discovering two chambers were .403 and had @DougGuy open them up.
With the factory Hornady expander, I couldn’t get the .403 bullets to seat without damage. So I ordered one of NOEs .401-.405 expander plugs with a Lee universal die.
All set.
The NOE plug has two shoulders on it, the first where it goes from .401-.405. Is the second one supposed to flare the case mouth?
My problem is, I still can’t get the bullets started straight enough to seat without damage, unless I run the expander deep enough for the case mouth to hit that second shoulder for a bit of flare.
This bullet has an extremely long nose to crimp and doesn’t seat very deeply. When I run the expander deep enough so I can get it started by hand, I can seat it almost to the crimp groove with just thumb pressure. That can’t be good.
I don’t have this problem with my NOE .38/357 expander. I just run it deep enough so I can hand seat the bullet to the first driving band. The case mouth never gets close to that second shoulder.
Need help!