Originally Posted By: CatShooterOriginally Posted By: Tnslim
Good morning (at 4:30 AM
)
You didn't say which Forster die you were using to "Full length size".
That is important.
If you are using the Bump die, the little ring is normal - when you chamber the case, does the little ring get shinny from rubbing the chamber (that would be normal too).
If you are using the regular FL die, and have the FL die all the way down, enough that there is cam-over, then your chamber might be a few thousandths short(er), or the die might be a few thousandths long(er) - (not unusual because of normal machining tolerances).
When you "Bump" a case, the body does not touch the die, so the 0.004" ring is a normal "muffin top" because of the unsupported case walls.
When you FL a case, the body gets "squoze" first, and so the shoulders move forward a few thousandths - then at the very end of the stroke, the shoulder gets pushed back and all is fine.
But with a short cut chamber, or long cut die (both can still be "In spec") the shoulder is not pushed back far enough.
I had a similar problem with my 6mmBR. When you fire the tight case, all should be fine.
I'm using the full length die, not the body die. If I fire one of the FL sized rounds( if I can get it to chamber) it takes an act of congress to get the bolt back to eject.
I've came up with an idea to remove the ring and that is to chuck it into a drill press and carefully use a fine file to remove the ring. Would that compromise the brass? I'd only need to remove around .002".