To much shoulder bump?

[Vettepilot]

I have some 30.06 brass that got oversized/bumped back way too far. In order to save it, here's what I'm going to do. First, I will anneal the brass. Then, I have some cast bullets that I am going to seat to jam length. I will load them with a reduced charge of a fast powder, and fire form them back to chamber size.

My idea with the bullets jammed is to force the cases rearward so that the shoulder will easily fireform forward, before the case expands and is trapped in the chamber. Actually shooting them with some lube on them has been suggested to me as well, for the same reason.

If I recall, these somehow got bumped to about .014" more or less. I had set them aside some time ago, so it's a bit "foggy." Ya know, old man and all...

Then of course, paper clip them good. Actually, I find these to be handier than a paper clip, and are dam handy to have around anyway:

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Vettepilot

 

[randy86314]

Late for this train.
IMHO, bumping .005" several times will lead to stretching and separation.

Test this. shoot a small batch multiple times, say 5 rounds, and watch for stretching (the shiny ring around the case about .200" from the base) or the groove inside.

 

[243winxb]

My question is how much bump would be to much and cause case head separation or damage ?

more.......
.014" in 223. Dillon RL-450 press. Defective shell plate in 1979. Each position had a different bump. No gauge or compatitor back then.

Most RCBS fl dies set the shoulder back .005" when shell holder and fl die make contact. Works ok. Bottle neck cartridges.

If brass is used for reduced cast bullet loads or jacketed in 30-06, i found the head to datum gets shorter.
Producing, excessive cartridge headspace. Here this brass is used only for reduced loads.

The annealed condition of the brass makes a difference, as does the action type. Autos will separate sooner. .

 

[Vettepilot]

Speaking of excessive bump---> If a brass case is dangerously stretched, is it always able to be discerned via the paper clip method? Is that safely reliable?

The reason I ask is that I have some older, Lake City brass that I picked up at the LGS. It has very definite marks on the cases above the bases. However, after cleaning them well, I can feel virtually no irregularity inside the case where you would suspect case stretch and an incipient separation. Nothing. Nada. Not with a paper clip, not with my favorite tool for checking- a scribe with a bend on the end.

I would like to use this 30.06 brass. The marks were around the case, up above the bottom, about where you would expect to see nasty marks. However, they were quite thin, and not shiny. Again, nothing on the inside.

Thoughts??

Thanks,
Vettepilot

 

[Dmagna]

I accidentally did .005 and ruined 50 pieces of brass. Had 3-4 case head separations in a row. Scared the shittt out of me, I learn that .0015-.002 is the most I'll do

 

[richhymas]

I accidentally did .005 and ruined 50 pieces of brass. Had 3-4 case head separations in a row. Scared the shittt out of me, I learn that .0015-.002 is the most I'll do

Any chance you also over tumbled these brass with steel pin media? .005 once doesn't seem like it will be enough to cause the case head separation that you are describing.

 

[Dmagna]

Any chance you also over tumbled these brass with steel pin media? .005 once doesn't seem like it will be enough to cause the case head separation that you are describing.

Tumbling with steel pins wouldn't make a difference. The brass was definitely thinning in the same spot. It was pretty shittty because at the time 257 bee brass was hard to find