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What brass can I turn into 7mm Dakota brass? #16431712 09/13/21
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slm9s Offline OP
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Would 7stw or 338rum be a candidate to become 7mm Dakota brass? (I have a bunch of those two) Other candidates?
Thanks.

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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16431748 09/13/21
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BWalker Offline
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Neither will work.

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16431787 09/13/21
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RinB Offline
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300 or 338 Dakota but you will need to set shoulder back OR

404 Jeff OR

There is an outfit that will make some for around $7 each with minimum order of 50 ($350 total). Search custom rifle brass. RCC Brass or something similar.

Last edited by RinB; 09/13/21.


“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16431838 09/13/21
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Both Dakota and Ultra Mag are variants of the 404 Jeffery, however all three have different rim diameters, the Dakota at 0.545”, the Ultra at 0.534” and the Jeffery at 0.537”. The Dakota brass is designed with an exceedingly proprietary thought in mind, same with reamer use. Dakota rifles are very much like what Weatherby was, perhaps even more proprietary whereby nobody chambers Dakota chambers in rifles except Dakota.

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16431878 09/13/21
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RinB Offline
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Ross I believe the 404 rim diameter is .545”.

Last edited by RinB; 09/13/21.


“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Originally posted by Brad.
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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16431936 09/13/21
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Rossimp Offline
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Yeah I have references from different manuals at .537” and others at .543”. Thanks.

Re: What brass can I turn into 7mm Dakota brass? [Re: RinB] #16431963 09/13/21
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Originally Posted by RinB


300 or 338 Dakota but you will need to set shoulder back OR

404 Jeff OR

There is an outfit that will make some for around $7 each with minimum order of 50 ($350 total). Search custom rifle brass. RCC Brass or something similar.


This is the correct answer. The rim on Dakota and 404J brass is nominally the same.

RCC has a very long lead time in my experience. Check the diagram they send you very carefully - that is what they set the mill to, and if it's wrong the brass is useless.

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16432006 09/13/21
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slm9s Offline OP
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Is it the head diameter? I've read some guys use .532 brass so they don't have to open their bolt face. Can anyone tell me what brass can be used? I've read RUM brass but it needs to be shortened, but they didn't say which RUM.
Thanks.

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16432016 09/13/21
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RinB Offline
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A bolt set up for the factory Dakota will have a bolt face for .545” rim plus usual clearance so the RUM cases at .532” won’t work.



“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Originally posted by Brad.
Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16432017 09/13/21
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Remember that the RUM’s are a rebated rim design.



“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Originally posted by Brad.
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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16432543 09/14/21
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BWalker Offline
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I'd rechamber for a RUM if it were me.

Last edited by BWalker; 09/14/21.
Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16432866 09/14/21
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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16433207 09/14/21
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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16433481 09/14/21
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Ouch. This seems like a reason not to have a Dakota chambering?

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16433887 09/14/21
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slm9s Offline OP
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That's why I'm seeing if I can form from something I have on hand.

338 lapua brass?

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16434195 09/14/21
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KenMi Offline
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Quality Cartridge will help you.
Not going to be an easy forming process, even if you had the right case head size.
Multiple steps, annealing, and probably a large percentage of loss.

Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16434588 09/14/21
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Originally Posted by slm9s
That's why I'm seeing if I can form from something I have on hand.

338 lapua brass?


No, the rim diameter is .588" with the Dakota being .545".


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Re: What brass can I turn into 7mm Dakota brass? [Re: slm9s] #16435845 09/15/21
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I think you'll have to bite the bullet and either get the brass from links posted or rechamber.


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