Can I fire form 308 Norma Mag brass in a 300 Win Mag chamber safely?

[UncleDano]

Have about 200 new 308 Norma Mag brass cases. I no longer have a 308 Norma Mag rifle.
Question is: Can I fire form 308 Norma Mag brass in a 300 Win Mag chamber safely?

 

[Trnelson]

NO!
308 Norma is too short and will rupture, if it fires at all in the longer 300 win mag chamber.

 

[UncleDano]

If this case headspaces on the Magnum belt, wouldn't this be just like fire forming a standard shoulder case to a say, Ackley Improved shoulder angle? The shoulder just forms to the longer chamber?

 

[Buttermilk]

As already mentioned, the Norma Mag case is too short.

Absolutely shouldn't do it.

Even if it fired, case is too short to be turned (fireformed) into a 300 WM.

 

[Dosh]

"danger will robinson"

 

[Lefty7mmstw]

putting a secondary shoulder on the brass may be enough to blow it out, but you are over a tenth inch short.
With 300win being rather easy to get and the rather high probability of case rupture, I wouldn't bother and sell your 308 norma brass to fund buying 300win brass.
I wouldn't do it and I fireform a lot of stuff...

 

[FEENIX]

"danger will robinson"

[ame]https://youtu.be/OWwOJlOI1nU?t=2[/ame]

[ame]https://youtu.be/hw3CE04LGiA?t=1[/ame]

 

[UncleDano]

Thanks to all for your comments and suggestions.
I will sell the brass if I can find a 308 Norma Mag owner & buy new brass.

 

[FEENIX]

Thanks to all for your comments and suggestions.
I will sell the brass if I can find a 308 Norma Mag owner & buy new brass.

You just saved yourself some headache ... pun intended. gun)

I know at least a couple of guys that shoots the .308 Norma here.

 

[Grumulkin]

Not to say I would do it, but I doubt the case would rupture. Some have shot 308 Winchester in a 30/06 chamber without a problem and ended up with a straight walled case.

Once again, I'm not saying I would do it.

 

[IdahoCTD]

It is safe to do because it headspaces on the belt but you'd get massive case stretch ahead of the belt without forming a false shoulder which would lead to premature case sparation. Selling it and buying 300wm is the wisest choice.