10mm buldge issue

[Bearcatrp]

Reloaded 100 rounds yesterday. 20 of them ended up with a budge. I belled correctly. 1st time this has happened. Is it possible to put these in the sizer die without the stem without a boom? Won't be possible to remove the bullet as these are seated right where the rim of the brass is even with the curve of the bullet. These are hollow points sierra 180 gr. Suggestions? I did check each case in the case gauge before I started loading. All were fine.

[xd ED]

I don’t know if you can resize them as loaded, but it would seem unless you strike the primer, there is no hazard of ignition.
When I have loaded something I don’t like, I use a kinetic pulling hammer, and start over.
My greatest concern would be what went wrong…insufficient lube?…..dirty brass?

[Bearcatrp]

Brand new brass. Carbide dies. I have a rcbs bullet puller. Think I will try that 1st before resizing. 80 out of 100 were good. Have no idea why the 20 are bad.

[crbutler]

Where is this bulge exactly?

I have seen bulges from seating the bullet slightly to one side or the other (the case doesn't properly center in the shell plate and the bullet leaves a bulge in the case where seated)... usually this shoot, albeit with a bit less accuracy.

The only time I have seen bulges at the base of the case was when someone hogged out their chamber to try and improve reliability... (read glock .40 S&W) and then you get something that looked suspiciously like a belted case. Those would not chamber (except in a glock... sometimes.)

If you are having this happen with new brass, and its up at the bullet end, you are probably dealing with a dirty shellplate. Not unusual to get brass shavings/dust when you size new brass.

As to "Sizing a loaded round"... while not saying to do it, fundamentally, that is what a Lee factory crimp die does.

[Bearcatrp]

I did feel resistance on some of the brass while seating. Its winchester brass. Maybe it bulged while seating. The belling was good as the bullet would crush the brass if not belled right. Glad I found this out now. Went through all my loaded magazines and found 2 more.

[crbutler]

Another common one is trying to crimp the cases too much. Usually that oops is obvious as to what is happening.

It really shows up if the cases have poor QC and have OAL all over the place.

[Bearcatrp]

I don’t crimp. I bell just enough for the bullet to enter the top of the brass. This way the bullet is seated tight. With 40 S&W and shorter brass, never an issue. With 10mm being longer, might be putting too much pressure on the brass. All the brass were the same length.

[Bearcatrp]

Well, removed the bullets. Not as bad as I thought it would be. Resized and checked with my case gauge. Will load them tomorrow to see if any issues.