To much crimp?
Case not expanded before seating? Fat bullet requiring to high pressure to seat bullet?
Bullet seated very crooked?
Pull bullet. Scrap case.
If that's a 38 special load, you might have inadvertently tried to load a 357 mag case and the press buckled it.
is the only one it's happened to
Be advised , if loading lead boolits a taper crimp die can size the boolit down a bit , not good for accuracy or the boolits ability to seal gases behind it.
A set of calipers before loading will help tell the tale , you`ll be surprised at the differences, I trim my revolver brass (1 of the not so enjoyable tasks of reloading) some tools make it go fast though, but ya still have to find the "short batch" so it`all will be the same.
If a batch is close enuff ,I`ll seat then crimp in separate steps .
Be advised , if loading lead boolits a taper crimp die can size the boolit down a bit , not good for accuracy or the boolits ability to seal gases behind it.
I feel a taper crimp die was made to close a auto pistol round after flaring to accept a boolit.
GP100man
Seating while simultaneously (excessively*) crimping . . . and in what looks like a total copper-clad bullet that has no crimp groove to start.**
* That's a lotta mouth roll-over crimp in pic#1 . . . especially for what looks like/may be a 38SP(?)
** Does the bullet have a crimp groove?
FWIW: run the cartridge back into the sizer die just enough to squeeze the bulge back . . . just enough to chamber.
- - Go thou out and sin not more - - (i.e., get/use bullets with crimp grooves, or seat/crimp in two separate steps.)
I agree that in your case it's likely what is described above. It doesn't look "manufactured" to me. I had a few .38s do this out of a large batch of mixed brass and my crimp was very light and the bulge was very pointy and in exactly the same place on all of my examples. It prevented chambering. In that case it only made sense to me that there was some anomaly or manufacturing defect or feature particular to this particular batch of brass. It wasn't the cannelure that some old brass has halfway down that you sometimes see. The sides of the cases were smooth inside and out. The cases were Western headstamp IIRC.
oh, I didn't take it to mean that. What I was saying is that in my case it appeared to be some kind of manufacturing defect. In your case it probably is the crimping issue described above.Sorry I didn't mean to imply that the rounds were manufactured, just that the brass was from some factory rounds rather than virgin brass.
If you are only doing handgun, I like the Lyman EZee trim kit.Yeah I have a set of calipers already, I just haven't really bothered to use them for measuring cases so far. With the new starline 45 colt brass it hasn't been an issue and with some factory once fired brass it was an issue with 1/300 so far. I can see it potentially affecting accuracy though even if it doesn't destroy the case.
Any suggestions for case trimmers?