why is my seating die crushing my brass?

[DukeDuke]

my redding die crushed 3 alpha 6 dasher cases.
first time in a year of using it.
any thoughts appreciated!

 

[RustyInBend]

Have you taken it apart to clean and lube (and inspect) it?

 

[Bill Norris]

Maybe re-adjust in in the press. Make certain the lock nut is tight and make certain the brass is going all the way into the shell holder.

 

[Terry]

Was the brass annealed?

 

[RegionRat]

Are we talking about seating a boat tail bullet into a chamfered neck?!?

How about a few details of the components you are loading and the neck prep details?

Crushing a neck with a sizer is one thing, and another with a seater. Also, tell us how you set up your die.

If you have more than one similar looking die, now is the time to make sure you didn't grab the wrong one.

 

[Doom]

The die probably can do a roll crimp and was set up incorrectly. Check the instructions.

 

[bigstick6017555]

Flat based bullet trying to seat on an trimmed case with an unchamfered inside neck can cause ruined cases

 

[DukeDuke]

the cases are FL sized, not annealed. The die is clean. Boat tail bullets. I've been using it for over a year with no issues.

 

[tsyarnall]

Is there a chance of posting pictures of the crushed brass?

 

[Murray Brook]

What type of a Redding seating die is it.

 

[Kracken McGraw]

The die probably can do a roll crimp and was set up incorrectly. Check the instructions.

I agree with this.
With seating stem backed out most the way, run brass in shell holder to top stroke in press and screw seating die down to touching brass. Now lower press ram and back seating die out a turn and lock it down. This should guarantee brass is not hitting the crimp feature of the seating die.

 

[Spoonbill]

Die screwed down a little too far?

 

[Gargoyle]

Different shell holder used?

 

[fkimble@charter.net]

Sounds like classic seater body screwed down too far. As already mentioned back it out at least a full turn. If as you said it has been working fine and no changes, then my guess would be the brass has gotten longer and has started hitting the inside of the die. Before changing anything, run a sized piece of brass into your seating die and see if it damages the case mouth or puts a bulge at the body soulder junction.

Frank

 

[DukeDuke]

 

[JFrank]

Expander ball might not be set correctly, or non lubed n grabbing the brass ?

 

[DukeDuke]

that is my guess, the necks are too thick for that expander ball?

 

[Bc'z]

Looks like your seater was set up to seat bullets in a 6br/bra last year.

 

[Kracken McGraw]

View attachment 1326562

Has a change up with the die made a difference yet?

 

[Kracken McGraw]

Just for drill , Try some dry lube ( on your balls) while sizing.

I think he’s saying this is happening on the seater die, Jim.