Necking up 6.5 SAUM to 7 SAUM

[DoSqH]

Thinking of adding a 7 SAUM rifle and with brass being scarce at the moment I wondered if necking up 6.5 SAUM to 7 SAUM is viable?

I have never necked up or down any cartridge and wanted to know a few things...

1. It seems possible to do this, am I correct?
2. From what I understand the necks will get thinner...is there a point where they would get too thin in this operation?
3. Current necks measure .015” and .0145” on average amongst certain lots of brass...will these be sufficient to neck up?
4. Are there trade offs from using virgin 7 SAUM brass that I should take into consideration?

What I have gathered so far is that to do this all I would need is a 7 SAUM sizing die. I do have a mandrel die and if the better process is getting a mandrel to neck up prior to using the sizing die I could do that as well.

Thanks in advance.

Jake

 

[Steel head]

I’d definitely use a mandrel and appropriate die/holder.
You could it in two steps as well 6.5-270 then 7 mm.

Depending on shoulder thickness you can get donuts from necking up because sone of the shoulder becomes neck.
Might have to ream or neck turn.

I neck up all my 260 brass from 243 and have done so for years.

 

[larryh128]

I converted some to 7 saum while I was waiting on ADG brass. I have a 6.5 Saum so after fired I ran them thru it and then thru a 7 saum die and they were fine. You could also load 10-12 grs of pistol powder, fill with cream of wheat, stuff tp in the neck and fireform them in the chamber.