Originally Posted By: ohihunter2014im a newbie but will offer my .02--With flat based bullets you have to chamfer the case mouth pretty good as I had somewhat the same issue but wasn't collapsing it it was cutting the bullet.
also I put my die in just barely until I can get the seat stem to touch and seat where I want. I noticed with my rcbs dies for 223 I set them at the instructions and still got crimp so I kept raising it until it didn't crimp at all. if you look at the very edge of the case mouth you should be able to see the brass start to roll inward if its a roll crimp seating die like mine.
you should seat then turn die in and crimp in a separate step by turning the seat stem out to where it doesn't seat again.
No bandwagon here.... I've watched most of your "problem " posts over the last year, from gun range memberships to rifle issues,etc... Plenty of good advice has been offered ,yet you drag your feet or want to debate what the problem is.
I try not to say much anymore because either, 1. I tend to tell it like it is (no sugar) and people don't like it . or 2 . It tends to be a waste of time .
On that note, now for thoughts of mine that maybe either right or wrong depending on who you listen too...
* A good tight neck even well champfered,will slightly "shave" a bullet. Barnes do this for me once in awhile. Don't bother me one bit.
** A seating die when properly set up per factory specs to not crimp... will not crimp.
*** If you want to crimp there is no reason to seat and crimp in more than one step. *** read single stage press**
**** Web info or face to face info, reguardless if they are a newbie or a season vet reloader, can be wrong.
Not trying to be a jerk, I'm just out of sugar...