7STW v. 7-300WM?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Derek M., Oct 25, 2013.

  1. Derek M.

    Derek M. Well-Known Member

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    You 7mm experts, please advise: What's the difference b/w the 2? I'm looking at another rifle maybe to put together next year. I sure like the thought of getting 300WM brass and necking it down because I've seen and read all about the difficulty finding STW cases.

    If both had a 27" barrel with a 180 VLD bullet, what's the difference? Is it substantial? I don't know squat about either.
     
  2. IdahoCTD

    IdahoCTD Well-Known Member

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    It's going to depend on magazine length. Both loaded to their potential at max length the STW will beat the 7-300wm by 100fps or so but the STW will be loaded close to 4" with 180's.
     

  3. Cornfield Flats

    Cornfield Flats Active Member

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    The last post is correct. The STW will have a little bit more powder capacity but with the scarcity of 7mm STW brass, the 7mm/300 is attractive.
     
  4. Derek M.

    Derek M. Well-Known Member

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    As an overall package, and namely, the brass shortage, I agree. 7-300 it is. Now, what barrel....hmmm
     
  5. Varmint Hunter

    Varmint Hunter Well-Known Member

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    You can duplicate 7STW ballistics with a 7-300Wby if that interests you.
     
  6. Derek M.

    Derek M. Well-Known Member

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    It actually does, except for the price of Weatherby brass, so that has to be ruled out. Thank you though.
     
  7. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    Or you can run 300 roy brass through a 7stw sizing die and have 7stw's after you square them up in a trimmer..... And you can use any other 2.85" belted brass to make your casings if you want. All it takes is wanting to.

    The 7-300 is a good round but you're reforming 300 win brass and that's about it unless you want to have a set of form dies made because you are moving the shoulder back so far from the la belted brass. If you can't find 300 win brass you'll have to form brass-- my local shops have been out of 300 win brass since last winter so I would be forming brass since I only have enough 300win brass for my 300win.

    Where I really see the 7-300win shining is in standard actions like the ruger77 where the 7stw can't be made to feed from the mag.
     
  8. IdahoCTD

    IdahoCTD Well-Known Member

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    I've used .300 Weatherby, .300 H&H, .375 H&H, and 8mm Rem. Mag brass to form 7STW. .300 H&H ends up with a short neck but they all work. The easiest is 8mm Rem. It's like necking a .300wm to 7mm :D.

    .300wm brass is hard to come by as well if your stuck on a brand but it's much easier to come by then 7STW or 8mm Rem Mag. If you open to using what you can get then 300wm is much easier to come by and will always be.