9mm loads bulging around case neck?
- Thread starter Shep546
- Start date
It it looks like an olde tyme coke bottle, it's normal. If it's right at the case mouth, you might be over crimping. The case mouth should measure .380 or .379
Seat the bullets in one operation and then crimp in another separate operation, when you seat (push) and crimp at the same time the case can bulge.
Second, how can a case headspace on the mouth of the case when it's over crimped?
Second, how can a case headspace on the mouth of the case when it's over crimped?
- Location
- Banana Republik of Kebekistan
Looks great to me. If it chambers neatly, does not get stuck, hit the range and shoot the darn thing along with her 999 sisters!
If look matters that much to you, there are dies that neatly shapes finished rounds like factory rounds.
If look matters that much to you, there are dies that neatly shapes finished rounds like factory rounds.
Yep. It's hard to tell, but the factory bullet on the right looks like the case mouth may have been crimped to the limit.
As you note, 9mm headspaces on the case mouth, so the case shouldn't be crimped in flush with the bullet.
The bit of a bulge to the base of a reloaded round is common. Sizing dies often size a bit smaller just to make sure the case holds the bullet securely.
I do this with a seater die, and then use a Lee Factory Crimp Die to do a taper crimp and post size. Good for getting rid of any bluge at the base of a case if it was fired in a gun without a fully supported chamber (Glock)
Last edited:
- Location
- Niagara Region, Ontario. For now
Perfectly normal....
With lead, and plated that are oversized it will be even more pronounced.
As long as they drop in and out of the barrel freely you are GTG.
With lead, and plated that are oversized it will be even more pronounced.
As long as they drop in and out of the barrel freely you are GTG.
- Location
- Niagara Region, Ontario. For now
As to headspace vs. Crimp.....
This is why you typically taper crimp cartridges that headspace on the case mouth, and roll crimp cartridges that headspace on the rim.
Two different crimps with very different appearances.
Taper crimp simply tapers the case mouth to ensure feeding more than bullet retention, and should be minimal IMHO.
Roll crimping can be applied much heavier and actually bites into the bullet, or fits into a cannelure, and provides retention, especially in magnum revolver/lever cartridges.
This is why you typically taper crimp cartridges that headspace on the case mouth, and roll crimp cartridges that headspace on the rim.
Two different crimps with very different appearances.
Taper crimp simply tapers the case mouth to ensure feeding more than bullet retention, and should be minimal IMHO.
Roll crimping can be applied much heavier and actually bites into the bullet, or fits into a cannelure, and provides retention, especially in magnum revolver/lever cartridges.
