7mm+270WSM-Brass-???????

Discussion in 'General Discussion' started by wildcat, Mar 9, 2007.

  1. wildcat

    wildcat Well-Known Member

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    Hey-guys;-if-I-go-with-the-7mm-WSM-I-want-to-use-the-Norma-brass.-So-is-it-easier-to-neck-up-the-270-WSM-brass-to-7mm-instead-of-using-the-Norma-300-WSM-brass.-If-I-use-the-300-WSM-Brass-I-will-have-to-fireform-right?-but-if-I-use-the-270WSM-brass-all-I-have-to-do-is-neck-it-up?-and-of-course-have-the-reamer-made.-Help;-please!!!
     
  2. Pete L

    Pete L Well-Known Member

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    I use Norma brass in my 7mm wsm but its has been chambered using a 7mm/300wsm reamer,all I do is neck the bras down in 2 stages using by redding neck die with 2 different bushes then I neck turn to make sure the brass ic concentric,you can get a die to neck down in 1 go but I dont like doing it like that I would rather take 2 bits of the cherry so to speak so not to ruin or deform the brass,takes a bit longer but whats the rush
    Forgot to add after all this necking and re sizing I anneal before firing
     

  3. ol mike

    ol mike Well-Known Member

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    I'm 95% sure you can just put a boat tail .284" bullet on the .277" case mouth and seat it ---> you're done!
     
  4. 1doug

    1doug Well-Known Member

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    the 7mm wsm and the 300,270 wsm brass does not have the same dimensions. the 7 wsm has @ 2.5-3 grains more capacity. the shoulder on the 7wsm is blown forward more than the shoulder on the 270,300 wsm's. You will need to fire form the brass if you use the norma brass.

    d-a
     
  5. Pete L

    Pete L Well-Known Member

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    imagine the neck tension of that,no mate thats NOT the right thing to do
     
  6. wildcat

    wildcat Well-Known Member

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    So;-would-it-be-better-to-use-the-300-WSM-and-neck-it-down-to-7mm-and-then-fire-form-the-case?-Thanks-guys-for-your-help-so-far.