308- 7mm-08 question

[Alderman]

Just hypothetical as I don't plan on doing it.
I was reading about sizing 308 brass to 7mm-08.
Can 7mm-08 brass be sized up to 308?
If so, if you sized 308 to 7mm-08,
could you size the same brass back to 308? Would this work the brass too much, leading to premature failing?


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[wlhicks264]

Lot of work and stress on brass for as easy as it is to get both cases, case life might be shorter working brass like that without annealing?

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[Alderman]

I was kind of thinking that might be. I only asked as I read where somebody made 308 into 7mm-08, then found a good supply of 7mm-08. He was going to discard the 308 brass because it didn't have the right head stamp and I was wondering if it would even be worthwhile to convert them back if it could be done.
Just bought a 7mm-08 and I was happy to find brass for it at the LGS.
The only brass I've ever reformed was 30-30 to 7-30 Waters.

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[drakehammer]

The neck lengths are different so ideally you just stick with the right stuff.


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[longrangehunter]

Sizing down from 308 Winchester to 7mm-08 the necks get thick and could need to be neck turned if the chamber is on the tight side, or fine if the chamber is on the fat side. A lot of work IMO when the necks need to be turned.