7mm WSM brass

swpc629

Well-Known Member
Joined
Dec 5, 2009
Messages
281
Location
Gardendale, AL
Does anyone have an opinion on whether you can resize 270 wsm and 300 wsm brass to 7mm wsm brass? I know there is a different headspace for the 7mm than that of the 270 and 300.
 

dirtball

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Joined
Jan 18, 2007
Messages
795
Location
Fairfax County, Va
If you are resizing 270/300 WSM brass because you cant find 7 WSM brass and are going to fire them in a standard 7 WSM chamber then use the 300 WSM brass and only size the neck down to where you have a snug fit when closing the bolt, leaving part of the 30 cal neck as a false shoulder.
Dave
 

geargrinder

Well-Known Member
Joined
Nov 6, 2006
Messages
2,007
Location
Dayton, Nevada
I use the 270 brass. I'll neck up to 30 cal. Then size to 7mm leaving the false shoulder.

I use the 270 brass because my chamber neck is on the small side and I don't want to turn thick necks.

I'm also using Norma brass. I don't think it would be worth the trouble for factory brass.
 

J E Custom

Well-Known Member
Joined
Jul 29, 2004
Messages
10,725
Location
Texas

+1

If I were going to size from 300 wsm it would have to be the lapua brass, and they don't
make it so I use the Winchester 7mm WSM and have no complaints.

I can weight sort the Winchester and end up with matched brass a lot cheaper that
has the right case head stamp on it.

Norma makes good brass but they are proud of it.(twice as much as the Win or Rem brass)

J E CUSTOM
 

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