Neck bulge when seating bullet

[bsparker]

I used a neck collet for .303 Brit, had to give them a good push when sizing to get enough tension on the bullet (150gr spbt PPU).

Did the neck on this one bulge because it didn’t seat straight?

the rest look good. Anything else that could have caused this? Safe to fire? It chambers fine.

thanks

 

[Charlie98]

Question: Do you have the expander ball in the resize die? It almost looks like a .308 expander ball... and you are trying to shove a .312" bullet in there.

 

[243winxb]

Search here. https://support.leeprecision.net/en/knowledgebase a collet neck die can cause issues.


But when seatig bullets, this-
A neck or shoulder bulge can be caused by to much crimp. Trim length needs to be nearly the same for all brass.

 

[243winxb]

.303 Brit

Tend to have large chambers , so neck sizing helps reduce case separations.

If the shoulder is not pushed back to much, its ok to fire.

 

[bsparker]

Question: Do you have the expander ball in the resize die? It almost looks like a .308 expander ball... and you are trying to shove a .312" bullet in there.

I had the same thought. As I'm thinking back over it, I likely made a mistake on the first case I resized. I resized and decaped, coming down I stuck in a new primer (something I shouldn't have done before checking neck tension). When I realized the lack of tension, I took out the decaping madrel--as to not waste a primer--and raised the case into the neck sizer again till I got more tension. The rest (only 14 others), I decaped and checked tension before priming. I was trying not to waste a primer, and it revealed a flaw in my process.

I'm going to try another 15 tonight and if I have a similar result without this error, I'll have to do a bit more digging...

 

[bsparker]

Search here. https://support.leeprecision.net/en/knowledgebase a collet neck die can cause issues.


But when seatig bullets, this-
A neck or shoulder bulge can be caused by to much crimp. Trim length needs to be nearly the same for all brass.

Didn't know about this site, thanks for sharing.