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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 :(
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
@grandpamac I feel like if anyone knows a way you might ? Any suggestions ?
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.
Unlikely, but if it really is doomed to failure then I have a batch of 7mm wsm Norma brass for @223nut :DQuote:
Originally Posted by 7mmwsm
Get a 3006 nro
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Nro was meant to be bro ,broQuote:
Originally Posted by NRT
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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
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.
Greetings dannyb,Quote:
Originally Posted by 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 :thumbsup:Quote:
Originally Posted by grandpamac
Unfortunately or fortunately for @223nut I also have 50 cases that have been fired so looks like he's got some extra brass :D
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 :D you need to come up for another hunt anyways :)Quote:
Originally Posted by 223nut
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???
Will have to wait and see both rifle and brass are in transit still :oQuote:
Originally Posted by Micky Duck
Greetings Micky and dannyb,Quote:
Originally Posted by Micky Duck
I almost suggested this but there may be a fly in the ointment. The resized cases will be around .007" or 0.18mm larger in neck dia than a .270WSM case. The chamber is likely large eough to accept this but maybe not. The difference between a loded round and a fired case in my 7mm SAUM is less than that so assuming the same tolerances the reformed cases may not chamber at least not easily. My recent fiddling with a comparitor and competition shell holders suggests that most chambers are batween .002" or 0.05mm and .008" or 0.2mm longer than sizing dies. This is well short of the 0.038" or 0.96mm difference between the .270 amd 7mmWSM nominal chambers.
Regards Grandpamac.