Ring on the head after fl resizing of once fired brass

[Anakin]

Hi all, just started reloading and my first batch is once fired 30-06, I shot them through my 69 Winchester model 70 that I bought a couple of month ago. After resizing I noticed a ring at head location where head separation usually happens. I also looked at the brass before I resize, I noticed a bulge at that location. I'm worried about the safety using those brass, please give an idea about how it happens and how I should deal with it. Thanks!

Attached is two brass before/after fl resizing

 

[Ggmac]

Was that brass fired in that rifle ? If not I would start with new brass , the brass was obviously shot in a large chamber .

 

[Rsadams]

Probably just the chamber.. But you need to post some pictures to look at for help...
Welcome to the board..

 

[Anakin]

Probably just the chamber.. But you need to post some pictures to look at for help...
Welcome to the board..

Thanks for your fast reply, I just attached a photo, before/after resizing. Is it safe to reload? or it may reduce the brass life since the metal around the head is worked more?

 

[Anakin]

Was that brass fired in that rifle ? If not I would start with new brass , the brass was obviously shot in a large chamber .

Yes, once fired, I agree that the chamber is the issue, I have two fired brass from m1 garand and they don't have the bulge and the ring

 

[Fast14riot]

https://sierrabulletsblog.com/2015/08/12/reloading-101-case-diagnostics/

It's common with 30-06, it's where the case web thins out and a maximum size chamber. Look at #4 in the link above, this is what you are seeing. I have some brass at home fired in a military rifle (1918) that is pretty extreme in this condition, but I load moderate pressure loads for it.

 

[Anakin]

https://sierrabulletsblog.com/2015/08/12/reloading-101-case-diagnostics/

It's common with 30-06, it's where the case web thins out and a maximum size chamber. Look at #4 in the link above, this is what you are seeing. I have some brass at home fired in a military rifle (1918) that is pretty extreme in this condition, but I load moderate pressure loads for it.

Thanks a lot for the link, I'll load moderate pressure and see how the brass expand, how many reloading cycles do you think I might get from those brass if I continue shooting from my old model 70?

 

[ireload2]

That is a result of firing brass in a chamber that is about .007 to .010 larger than the case head. It can be caused by under size brass or by a large chamber or a combination of both conditions.

 

[Ggmac]

I'd check headspace just to be sure of rifles condition .

 

[Anakin]

That is a result of firing brass in a chamber that is about .007 to .010 larger than the case head. It can be caused by under size brass or by a large chamber or a combination of both conditions.

Thanks, what's the cause of large chamber, heavy wear or manufacture's spec? If it's solely due to wear, I may consider a new rifle

 

[BoydAllen]

It was that way when the rifle was built. If you want to check your cases, have you heard of the paperclip method? Straighten a good sized paperclip to produce a straight section that is a little longer than the case is. At the end of the straight section bend the wire to form a 90 degree angle with an extension of perhaps 1/8". You can use this to feel for any thinning just above the web. It will show up as a groove that is easily felt.

 

[dkhunt14]

It was made that way. Factory usually keeps them on the large size. Occasionally they are too large. The pics make that one look big. Matt

 

[Anakin]

It was that way when the rifle was built. If you want to check your cases, have you heard of the paperclip method? Straighten a good sized paperclip to produce a straight section that is a little longer than the case is. At the end of the straight section bend the wire to form a 90 degree angle with an extension of perhaps 1/8". You can use this to feel for any thinning just above the web. It will show up as a groove that is easily felt.

Yes, I found this technique when searching for head separation, I'll try it after 1 or 2 reloading cycles. Will the brass last longer if I only resize the neck? Since I already have fl die, maybe just ram the case half way? Thanks!

 

[ireload2]

A large chamber can come from sloppy manufacturing. I have seen this problem mostly on Turk and Spanish Mausers in 8X57 and 7X57.
You can measure the back end of the chamber indirectly by measuring 8 or 10 of the fired cases at the pressure ring.

If you have any of the unfired ammo measure the pressure ring area with a mike. Then compare the ammo and the chamber to the SAAMI drawings.
I would bet you have some small brass in a middle of the tolerance band chamber. I don't know how you would wear a chamber oversize unless you were a Spaniard shooting mercuric corrosive ammo in a neglected old Mauser for 50 years.

Thanks, what's the cause of large chamber, heavy wear or manufacture's spec? If it's solely due to wear, I may consider a new rifle

 

[Ggmac]

Does your bolt # match the receiver ?

 

[powderbrake]

Yes, I found this technique when searching for head separation, I'll try it after 1 or 2 reloading cycles. Will the brass last longer if I only resize the neck? Since I already have fl die, maybe just ram the case half way? Thanks!

I had a 243 that looked just like your pics, and got case separation. I then started to neck size only, and no more problems with the same lot of brass.

 

[Anakin]

Does your bolt # match the receiver ?

Yes, the rifle has matching number

 

[Anakin]

I had a 243 that looked just like your pics, and got case separation. I then started to neck size only, and no more problems with the same lot of brass.

How did you control the headspace?

 

[Ggmac]

Buy neck sizing or not pushing the shoulder back . Once the brass expands its at what ever your rifle is set to , when you full length resize you start from square one and continue to stretch the brass

 

[Anakin]

Buy neck sizing or not pushing the shoulder back . Once the brass expands its at what ever your rifle is set to , when you full length resize you start from square one and continue to stretch the brass

Thanks, so I just neck sizing the brass and not worrying about the headspace because the fired brass should automatically match the headspace in that specific rifle?