to much shoulder bump

[piaa1209]

If you have match casings with to much shoulder bump, could you reduce the load and re-fire form these casings to your chamber.

 

[joshb]

Yes, but.........
I had this problem with a 6ppc I bought. The used brass I had was short for the chamber. I loaded up some rounds with the bullet jammed, thinking that would hold them to the boltface. It didn’t work. Half didn’t fire. I was advised to create a false shoulder by expanding to 6.5, then resize the neck. That worked!

 

[grovey]

A primer with a softer cup should help them go bang.

 

[Dusty Stevens]

False shoulder is the answer

 

[Link]

If you have match casings with to much shoulder bump, could you reduce the load and re-fire form these casings to your chamber.

How much is to much ? Just wondering.

 

[BenPerfected]

How much is to much ? Just wondering.

IMO, no more than a .003 bump is needed using fired cases from your chamber.
Ben

 

[Willie]

Just finished fire forming 100 parent cases for a 6.5 WC, using a false shoulder, with far better consistency than my first batch five years ago using jam.

I think some people assume fire forming fills out their brass 100% and they start bumping the shoulder prematurely. On my current batch of once fired brass, I set my die where it would size the brass minimally, but would not bump the shoulder. Did 5 cases with the longest base to datum measurements from first firing. They all chambered without any stiff resistance, telling me the other 95 didn't need bumping at this point. After 2nd firing, I'll use the stripped bolt to set my final bump-to length.

But, back to OP's question, " Just load the short cases and shoot, annealing will make for easier forming".

 

[piaa1209]

My bump on mine are .0015 and on the short cases they are .003 to .004. I use br2 primers, but would a 210m have a softer cup.