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Thread: 257 wby brass from 8mm Mag

  1. #1
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    Default 257 wby brass from 8mm Mag

    I'm looking at building a 257 Weatherby. Weatherby brass for this caliber is rather spendy, although I hear it's nice since it's made by Norma.

    I read that you can neck 7mm Rem Mag brass down in one pass through a 257 Wby die, but that it ends up a bit short.

    Since the 257 Wby is based on the 8mm Mag case, would it work to just neck (and then maybe trim) 8mm Mag brass down? Coud this be done in one pass through a 257 Wby die?

    Thanks!

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    Wink Try it.

    Donít know if you can do it in one shot but itís worth a try. If not you should be able to find size dies for calibers in between to make it in two or three steps. Necking down is better than up as the necks will stay thicker for you. Anneal the necks, oil them, and remove the expander from the dies. I have done it the other way for years with 30-06 brass to make 7.7mm Jap from them. I would anneal between each step if you canít do it in one step. The 06 to 7.7 only takes one and a fire form from the first loading, but you will be going a lot farther than that with yours.

    Andy

  3. #3

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    Quote Originally Posted by AKArcherdaddy View Post
    I'm looking at building a 257 Weatherby. Weatherby brass for this caliber is rather spendy, although I hear it's nice since it's made by Norma.

    I read that you can neck 7mm Rem Mag brass down in one pass through a 257 Wby die, but that it ends up a bit short.

    Since the 257 Wby is based on the 8mm Mag case, would it work to just neck (and then maybe trim) 8mm Mag brass down? Could this be done in one pass through a 257 Wby die?

    Thanks!
    Actually WBY used the 300 HH case as a basis for many of his cartridges, so that can be used, as well as the 375 HH and the 8mm Rem Mag. Have to watch for neck thickness though. 264 win mag works too, but like the 7mm Rem Mag is a bit short.

    WBY factory brass is about $30 for 20 or $120 or so for 100ea. The WW brass is cheaper. So, depends on what level of effort you want. Normas brass is nice, but seems a bit soft. Primer pockets expand for me after 3-4 firings.

    Nonte's Home guide to Cartridge Conversion and John Donnleys big green book Cartridge Conversions details how to make the 257 WBY case, and many others.

    I enjoy the tinkering with cases, but lately want to spend more time shooting and hunting.

    Exciting cartridge, I think you will like it!

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    Default

    I too like tinkering with cases and have formed many cases but to start with 8mm Rem mag to get to 257 Wby is the long way around the barn. The cases would have to be annealed. The wall thickness at the shoulder for the 8mm would make the neck too thick for the 257, you'd have to neck ream (not turn) to remove the dough-nut. You end up pushing the shoulder too far back. You absolutely won't do this in one pass and you won't do it with the standard 257 sizing die. You would need to do it in steps. I'd accept the slightly shorter 264 Win mag and that can be done in one pass with new soft brass. Personally I have found that going cheap for brass always ends up costing me more in the longrun.

    There is still Weatherby brass on the shelf around town and it will would last much longer than reformed stuff and be well worth the investment.

    And I don't think the 257 WBY is based on the 8mm RemMag, the 257 was here first. It is based on the H&H case.
    Is there nothing so sacred on this earth that you aren't willing to kill or die for?



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    AKArcher,
    I have a 257 WBY and I have used 264 WM and 7mm Rem Mag cases. They measure out @ 2.490 in length. I cant tell any difference in accuracy when compared to the Norma 257 cases. I am on 3 firings to date on the 264's and seem good for a few more. I do anneal them and use the Rooster lube. Works out great. One pass and done.

    If I recall the 264 WM is within 1k psi of the 257, while the 7mm was a lil more of a spread, if it should matter.

    The 257 STW and the like are based on the 8mm Rem Mag if I recall correctly. I tried 300 WM at one time cause I had about 50 cases, but gave up. Just too much work.

    Hope it helps ya.

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    Default oops, you're right!

    Yeah, that's right, the 257 Wby case was based on the 300 H&H case, not the 8mm Rem Mag. I got it mixed up with the STW's.

    Anyway, thanks for all the input. I'll probably buy at least 50 257 Wby cases, but may experiment some too. I've got a bunch of 7mmRem Mag cases at home, more than I need, so I'll probably convert a few of them, and test them for accuracy next to the Weatherby cases. If I can't tell a difference in accuracy then I'll convert more. I'll definitely anneal the necks and upper shoulder beforehand.

    I notice that Midway is all out of 264 WM cases, and that the only brand they will backorder is the Nosler Custom. The 257 Wby brass is only available in boxes of twenty, and even that is out of stock. Sounds grim. If I can't find some around town, looks like it will be 7mmRem Mag cases or nothing, at least for now. No rush though. I'm still months out on this project and maybe in the meantime something will shake loose.

    Thanks!

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    Default I'll check my spare brass stockpile

    I'll check through my one fired brass and see what I have - I should have some extra once fired Weatherby brass in. 257 WthbyM, .270 WthbyM or 7mm WthbyM to to get you started - they all all appear to be the same except for the neck according to the reloading book dimensions.

    Quote Originally Posted by AKArcherdaddy View Post
    Yeah, that's right, the 257 Wby case was based on the 300 H&H case, not the 8mm Rem Mag. I got it mixed up with the STW's.

    I notice that Midway is all out of 264 WM cases, and that the only brand they will backorder is the Nosler Custom. The 257 Wby brass is only available in boxes of twenty, and even that is out of stock. Sounds grim. If I can't find some around town, looks like it will be 7mmRem Mag cases or nothing, at least for now. No rush though. I'm still months out on this project and maybe in the meantime something will shake loose.

    Thanks!
    Living the urban lifestyle so I can pay my way and for my family's needs, and support my country. And you?
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    Default cool

    Thanks tvinak! No rush, I haven't even ordered the dies or barrel yet, but I'm pretty sure this is the caliber I'm going to go with so if you get around to it and find some used brass you don't anticipate needing again in the future, let me know!

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    Default barrel ordered!

    Well, I ordered a 26" SS 257 Wby barrel with a 1-10" twist from PAC-NOR. They were super helpful, and are willing to go the extra yard. One of the "custom" touches they are willing to do on a pre-fit barrel at no extra cost is adjust the length of the throat to fit a particular bullet. You send them a dummy round loaded with your choice of bullet and how far off the lands you want that bullet to be and they do it.

    I needed to get them that dummy round ASAP so I went ahead and ordered 40 pieces of 257 Weatherby brass from Midway, along with dies and some bullets. $65 for 40 pieces of brass..OUCH! Anyway tvinak, if you find some once-fired brass, I'm OK for now but wouldn't mind 20 or 30 more pieces.

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