Seating die squish???

[Aloeus]

Hi All, I'm wondering what happened here:

Trying to seat these BD2s in 7-08, and this one, the third case through, does this. We did 20 others and they all came out (and shot) fine. Is this a defect in the case, some weird interaction with the seating die, or something else I'm not seeing? I'd like to avoid randomly squishing cases in the future. This was the standard Redding seating die with micrometer.
Side by side with factory ammo, since we shot all the others we loaded up:

Also, should we shoot this? I'm tempted to see if it chambers, and if it does can we fireform this back into proper shape?

 

[Ckgworks]

I have seem this happen with too long of brass, or if the brass is different length and die is set to crimp on a short case. Was the brass all trimmed to same length?

 

[Aloeus]

I have seem this happen with too long of brass, or if the brass is different length and die is set to crimp on a short case. Was the brass all trimmed to same length?

This is unfired nosler brass. I didn't check the length because I didn't think it would be an issue.

 

[RidgeTop]

Chamfer the case mouth

 

[cornshank]

I have had same problem with a batch of hornady brass , took a reamer by hand and took a little off the inside , worked ok for me.
Same die set up had no issues with a different manufacturers brass.

 

[birddog 68]

Did you neck size? I never used BD's but a chamfer would probably help with seating.

 

[Aloeus]

They come chamfered from the factory, but I wouldn't be surprised if this specific case wasn't chamfered properly or was otherwise out of spec. I'll take a look when I pull it (need to get a 7mm collet)

 

[parshal]

Your die is set too low. This has happened to me. The crimp part of the seating die is hitting the case mouth. Back your die off.

 

[rsbhunter]

How was the seating pressure, did it feel "tighter" than the rest? Do you use a mandrel to size the necks during reloading. Any more, I run every case new or resized thru the mandrel die, more consistent seating, and I catch cases that have tight necks....rsbhunter

 

[OldElkHunter1961]

If the case head reads "7mm Rem Exp," "280 Rem" or "280 AI" you've found the culprit.

 

[CNY Yote Hunter]

Only time I have ever had that happen is when the brass was too long and the seating die was set really close to crimping. Try backing off your die a bit and then the indifference in brass length won't matter.. if that's what caused this.

 

[OldElkHunter1961]

If the case head reads "7mm Rem Exp," "280 Rem" or "280 AI" you've found the culprit.

OBTW that was attempted humor. Put the torches and pitchforks away!

 

[Teri Anne]

This is unfired nosler brass. I didn't check the length because I didn't think it would be an issue.

I have run into this from time to time too and it always has to do with the crimp. I can't tell from the picture whether there is a canellure on the bullet but looking at the cases side by side it appears that they are the same length to the top of the case meaning the damaged one would have been too long for the setting of the crimp. Always check the length on all brass, no matter if it is used or new. There is a lot of variation even with new factory brass.

I would not try to fire this case or any one like it. Put it up on display on your loading bench as a reminder not to do this again.

 

[RUFFIAN R - NY]

Have seen this also from dirty dies- too much lube build up - dies not set right- brass not set to proper length/ trim .- too much lube on brass and air hole not clear.- crimp adjustment