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Thread: 257 Weatherby Magnum

  1. #1
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    257 Weatherby Magnum

    A mate has asked me to help set up reloads for one.

    I'm looking for any tips or advice for this cartridge because I haven't reloaded for a belted magnum before.

    Name:  257 Wby Mag SAAMI.jpg
Views: 304
Size:  339.6 KB

    I understand that the first thing is to set up the sizing die close top the length of the fired case so you only bump the shoulder back .003" approx. (same as all cartridges). The Weatherby doesn't seem to have an official datum on the shoulder, just specs for the end of the case body and the start of the neck. Would it be OK if I just use my 0.400" collar and use a length from case base to that ? Or does it have to be .3963" x 2.117- ? I see the chamber spec uses a 0.4050" diameter.

    I think the rifle is a Weatherby Mark V .
    I'll be using a co-ax press and Redding dies.
    I'm used to loading for 7mm08 and .303.

    I haven't got a Weatherby case holder for priming so might just have to use the priming facility on the press ?

    I'll ask more questions but first see what comes back for those two.

    What else should I look out for ?

    Many thanks in advance.

  2. #2
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    What Projectiles are you considering ?
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

  3. #3
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    Pick one random case and put a mark on the neck with white board marker. Work out from there what your die setting is, start long and size down until you're just touching the shoulder then stick the expander ball back in? Works for me and you don't have to measure anything. Test each case on the first batch, none should be long though. The belt becomes decorative then...
    nor-west, takbok and mimms2 like this.

  4. #4
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    I do like me some priming-on-press. Efficient? Maybe not.

    I think you're overcomplicating it. Load cases. Shoot paper.
    If OK: shoot meat
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  5. #5
    Pure-bred Mutt
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    What are you hoping to achieve wth reloads that you','re not getting from faxtory?
    Diligentia Vis Celeritas
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  6. #6
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    I haven't checked but I think its relative obscurity as a cartridge would make factory ammo scarce and expensive
    csmiffy likes this.

  7. #7
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    Quote Originally Posted by stevodog View Post
    I haven't checked but I think its relative obscurity as a cartridge would make factory ammo scarce and expensive
    Yup. Doubt there would be much around to pick from.

  8. #8
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    Quote Originally Posted by stevodog View Post
    I haven't checked but I think its relative obscurity as a cartridge would make factory ammo scarce and expensive
    A few years ago I ordered some factory ammo for the above calibre from Hunting and Fishing. I don't think the fella who I spoke to knew much about it, or anything really and verbally indicated it would be expensive-around $180 for two boxes. When it finally arrived a couple of months later I had to pay about $350 for the two boxes!

    On a positive note, it was this that encouraged me to getting into reloading. As yet, however, I haven't needed to load for it as its not my main rifle. Will follow the thread with interest.
    Moa Hunter and stevodog like this.

  9. #9
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    This be one cartridge that you'll get about 6 barrels to one set of reloading dies haha.
    tetawa and Cliff like this.

  10. #10
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    @gregdudehunter

    Sent from my ELE-L09 using Tapatalk

  11. #11
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    Looking at the headspacing, most cartridges have a length of conical shoulder so that measuring to say .400" diameter will define the headspace dimension quite well. But the Weatherby have two circular radius edges and hardly any shoulder, which is almost flat. So perhaps measuring headspace with a .400" hole might be quite insensitive, varying substantially from one case to another. Would I be better to try and get the guage onto one of the curvy radius parts and are they even similar shapes between rifles ?

    Here's a picture comparing the shape of the 257 Weatherby to .308 win and 7mm Rem Mag.
    (just copied and stretched from the wikipedia pages, showing shape not exact size).
    Name:  Magnums.jpg
Views: 136
Size:  94.7 KB

  12. #12
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    To be honest, don't even bother as you are only loading for one rifle that is your gauge. Place a mark on the neck of the case, vivid whiteboard marker etc and just wind the die down until you are just brushing the neck. You only want to bump the shoulder enough to avoid hard chambering in that one rifle, so that's the measure you need.
    nor-west and Moa Hunter like this.

  13. #13
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    Thanks - use your own chamber as the headspace reference and not make up a nominal inch value to aim for ?
    Do you mean the neck or the shoulder ?

  14. #14
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    Bagheera, get hold of the rifle from your mate if possible and as you adjust the die down, check the case in the chamber. Keep going until the bolt close meets little/no resistance. I like to cycle the used brass and find the "stickiest" i.e. most expanded case in the batch to work with, assuming this will be the best indicator and not give a false positive so to speak. Apologies if i'm telling you how to suck eggs .

  15. #15
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    Quote Originally Posted by Bagheera View Post
    Thanks - use your own chamber as the headspace reference and not make up a nominal inch value to aim for ?
    Do you mean the neck or the shoulder ?
    This. Find the longest or stickest fired case, that becomes your 'set' case. Set the resize die up long - intentionally long, and mark the neck. Size the case, look at how far down the marking is wiped off and then adjust the die accordingly. When the die is set, the lockring means that the setpoint of the die is there forever and just continue the check procedure for the longest fired case each batch you do. By setting this way you are setting the die to the minimum resize needed for the chamber which should minimise sizing and also means the belt becomes kind of superfluous. One thing that might upset you doing things this way is with the belt and the case in front of the belt not getting sized. You could end up with a case getting sticky in the chamber and possibly needing to source a custom die - but also this might happen on any case/chamber combo.

 

 

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