Inconsistent headspace results on hornady 6.5 creedmoor brass

[perazzisc3]

After setting up body die to bump shoulder .004" back and checking shoulder after resizing a few cases and getting the results I setup for, I resized a total of 50 cases.
When done resizing I randomly rechecked a few more cases in the 50 and they were not all the same .004 bumped back. Did I do something wrong setting up the die or possibly the cases are out of spec?? The cases were all fired from the same rifle.

 

[prcomte]

What press are you using? Is the body die bottomed out against the shell holder? Are you Annealing your brass?


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[demolitionman]

Sizing lube buildup in the die is most likely the cause.

 

[Sig Marine]

Not all brass is the same length when it comes out of the chamber after being fired. Therefore, it's not all going to get bumped back the same amount. I measure 10-15 fired cases and take the longer cases of the middle half and set my dies to bump based on their length. Then I check to see if there are any problems chambering the sized cases. If none, I'm done.

 

[FLIGHT762]

Inconsistent case lube application will cause shoulder bump variations. Sometimes it helps to keep the case in the die at the top for 2-3 seconds before lowering it out. I sometimes run the case twice into the F/L die, pausing at the top. Try this and see if it helps.

 

[Milo 2.5]

Not all brass is the same length when it comes out of the chamber after being fired. Therefore, it's not all going to get bumped back the same amount. I measure 10-15 fired cases and take the longer cases of the middle half and set my dies to bump based on their length. Then I check to see if there are any problems chambering the sized cases. If none, I'm done.

Listen to this guy.

 

[perazzisc3]

What press are you using? Is the body die bottomed out against the shell holder? Are you Annealing your brass?


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Redding die,die is bottomed out,this brass was annealed

 

[perazzisc3]

Not all brass is the same length when it comes out of the chamber after being fired. Therefore, it's not all going to get bumped back the same amount. I measure 10-15 fired cases and take the longer cases of the middle half and set my dies to bump based on their length. Then I check to see if there are any problems chambering the sized cases. If none, I'm done.

I will give that a try

 

[perazzisc3]

Inconsistent case lube application will cause shoulder bump variations. Sometimes it helps to keep the case in the die at the top for 2-3 seconds before lowering it out. I sometimes run the case twice into the F/L die, pausing at the top. Try this and see if it helps.

I will try it and see

 

[perazzisc3]

Has anyone experienced this with Laua brass?