Case crunch

[golfish]

Have any of you guys seen this and know what the cause might be?

I was just loading 15 rounds on .308 using Hornady dies. The first 10 went smooth then I got two of these and then stopped.

The brass was clean and all the same length. Look at the gouging of the bottom of the bullets.

[Divernhunter]

check the size of the bullets. Happened to me when I got a few larger dia bullets mixed into my ones for loading.

[golfish]

check the size of the bullets. Happened to me when I got a few larger dia bullets mixed into my ones for loading.

Thanks for the reply.

I did check that, They're the right size.

[Beelzy]

Maybe the die is slightly crimping the bullet when seating?

[smoothy8500]

Maybe the die is slightly crimping the bullet when seating?

Or crimp is incorrectly set.

[baih777]

Check your brass to make sure its deburred on the inside.
Use something like a dental tool.
Or your deburring tool is making another burr.

I use this now.

https://www.amazon.com/RCBS-9351-VLD-Debur-Tool/dp/B000LC7LQ8/ref=mp_s_a_1_6?adgrpid=58943433507&gclid=Cj0KCQiAxoiQBhCRARIsAPsvo-zXvXZU4tsOUBixb7BwOHMYsE4Lt0U_DbmbdotijSnJBqPI7e1_1fIaAmT8EALw_wcB&hvadid=274745607748&hvdev=m&hvlocphy=9031045&hvnetw=g&hvqmt=e&hvrand=12603894373691383050&hvtargid=kwd-302223752125&hydadcr=9873_9624902&keywords=rcbs+deburring+tool&qid=1644360934&sr=8-6

[golfish]

Thanks guys, I'll check it all.

I'm not using a crimp, just seating the bullet. I haven't trimmed this brass, I just cherry picked anything between 2.011 and 2.013 but I will debur. I just loaded another 10 without any problems. I didn't see anything wrong with the die either.

[FLIGHT762]

Did you set the seating die up using the Hornady instructions?

They are set differently than other seating dies.

[smoothy8500]

Thanks guys, I'll check it all.

I'm not using a crimp....I haven't trimmed this brass,

Maybe the case mouths needs to be chamfered. The sharp edge caught the jacket.

[golfish]

Maybe the case mouths needs to be chamfered. The sharp edge caught the jacket.

It could be...Its just crazy that I loaded 10, then the 2 crunched ones. Stopped for a few days and then loaded 10 more with out problems.

Did you set the seating die up using the Hornady instructions?

Yes

Oh well! I'm not having any problems now

[Supertankerm60a3]

Like has been said. The inner edge is catching the bullet. If you di not have the correct case tool, a simple countersink will do the job. Just a tiny chamfer around the inner edge and everything slides easily.

[pacrat]

New Dies, or New Problem with old dies?

Check expander dia.

Check ID of necks after expanding.

Interference fit between neck, and bullets, should be .001-.002"

[divingin]

That first pic sure looks like it's crimped (but that may be the light combined with being out of focus.)

If not, then it's probably a sharp edge or bulge on the case mouth thickness on the inside of the case mouth, as said above. Couple of things may cause that (assuming the brass was not like that before): Trimming, which will leave a sharp edge inside and out (unless you have a 3-way cutter), and wet tumbling (thin brass gets peened, and it mushrooms the case mouth to a degree, thickening the wall at the case mouth.)

FWIW, I think the inner chamfer is more important than the outer. Outside edge may, in extreme situations, affect feeding to some small degree; inner scrapes the bullet affecting accuracy.

[LynnJr]

Seating die issue to me.
Back the die out 1 full turn and run the seater stem down and the problem will go away.

[golfish]

Back the die out 1 full turn and run the seater stem down and the problem will go away.

I did that after the 2nd bad one and finished that loading session this way (only 2-3 left to load)...I loaded a few more yesterday without any issues. Today was good too

Maybe the die is slightly crimping the bullet when seating?

The way the dies are setup there should be no crimp. They don't look to have a crimp. I loaded a few more today without issues.

New Dies, or New Problem with old dies?

Yes sir, new dies and a new problem, however the problem seems to have gone away..

Thank guys.. I really do appreciate all the help.