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Thread: 7mm wsm to 270wsm sizing

  1. #1
    Just another clown dannyb's Avatar
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    7mm wsm to 270wsm sizing

    I have been gifted a batch of Norma brass that is head stamped 270wsm but has been sized up to 7mm wsm, some is virgin unfired and some has been fired once.
    With the regaining of my old 270wsm I am keen to reclaim this brass for use in it.
    Is it a simple matter of annealing the brass then full length sizing in a 270wsm die and then checking trim length ?
    Strangely enough theres heaps of info on forming 7mm wsm brass from 270 or 300 wsm cases but nix info on going the other way
    #DANNYCENT

  2. #2
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    Thatd be quite a bump to go from the 7 to the 270. The shoulder on the 270 is further back than the 7mm. Just try one, anneal it, run it through your die and check it out. I feel like there will be a bit of damage to the case on the neck and shoulder
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  3. #3
    Just another clown dannyb's Avatar
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    @grandpamac I feel like if anyone knows a way you might ? Any suggestions ?
    #DANNYCENT

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    I'd be surprized if it was anything less than difficult, like @keengunNic says, a lot of excess brass that needs to find a home.
    Just going to take a look around the next bend...

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    Sell the 270 and buy a 7mm. Problem solved.
    chainsaw likes this.
    Overkill is still dead.

  6. #6
    Just another clown dannyb's Avatar
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    Quote Originally Posted by 7mmwsm View Post
    Sell the 270 and buy a 7mm. Problem solved.
    Unlikely, but if it really is doomed to failure then I have a batch of 7mm wsm Norma brass for @223nut
    7mmwsm and Micky Duck like this.
    #DANNYCENT

  7. #7
    NRT
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    Get a 3006 nro

    Sent from my Nokia 7 plus using Tapatalk
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  8. #8
    NRT
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    Quote Originally Posted by NRT View Post
    Get a 3006 nro

    Sent from my Nokia 7 plus using Tapatalk
    Nro was meant to be bro ,bro

    Sent from my Nokia 7 plus using Tapatalk
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  9. #9
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    Maybe give it a try it is a big shoulder bump but iv seen creed brass made from
    308 so what's their to loose I went 300 down to 270 wsm with ease

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    Hmm, depends if its actually been fired in a 7mm wsm or a 7/300wsm which are popular with the target crowd.

    If it's a 7/300wsm chamber then it will be easy to go back down to 270.

    If it's a true 7mmwsm chamber maybe not so easy.

    The unfired vs fired brass will give the answer.

  11. #11
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    Quote Originally Posted by dannyb View Post
    @grandpamac I feel like if anyone knows a way you might ? Any suggestions ?
    Greetings dannyb,
    If the .270 WSM brass has just been necked up to 7mm and has not been fired then there should be no problem in necking it back down. You should check if the shoulder has been moved forward. You can do this with a comparitor. The difference in length to the shoulder is 0.038" or 0.96mm longer for the 7mm WSM. The fired stuff is a different matter. If the cases were just necked up without forming a false shoulder and fired in a 7mm WSM chamber then they would have been fired in a chamber with grossly excessive head space. This could have weakened the case body just ahead of the web and can lead to a head separation. To be safe these should be binned.
    Regards Grandpamac.
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  12. #12
    Just another clown dannyb's Avatar
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    Quote Originally Posted by grandpamac View Post
    Greetings dannyb,
    If the .270 WSM brass has just been necked up to 7mm and has not been fired then there should be no problem in necking it back down. You should check if the shoulder has been moved forward. You can do this with a comparitor. The difference in length to the shoulder is 0.038" or 0.96mm longer for the 7mm WSM. The fired stuff is a different matter. If the cases were just necked up without forming a false shoulder and fired in a 7mm WSM chamber then they would have been fired in a chamber with grossly excessive head space. This could have weakened the case body just ahead of the web and can lead to a head separation. To be safe these should be binned.
    Regards Grandpamac.
    That's very helpful as I have 30 virgin cases that have been necked up to 7mm but unfired so these at least should be salvageable for me

    Unfortunately or fortunately for @223nut I also have 50 cases that have been fired so looks like he's got some extra brass
    Micky Duck likes this.
    #DANNYCENT

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    Sounds good to me... I need to get round to emptying a few more of my own
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  14. #14
    Just another clown dannyb's Avatar
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    Quote Originally Posted by 223nut View Post
    Sounds good to me... I need to get round to emptying a few more of my own
    Don't be in too much of a hurry as Powder and pills are scarce you need to come up for another hunt anyways
    #DANNYCENT

  15. #15
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    ok so I just have to ask....what happens if/when you chamber one of the upsized cases and close bolt????
    will it do so easily??? that SHOULD tell if chamber has been large on previous rifle....also if your chamber is on generous size to begin with it may not actually be such a big issue...maybe???

 

 

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