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Necking up or down??

 
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Old 03-25-2011, 07:30 PM
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Necking up or down??

I am trying to start reloading for a 7 wsm and sometimes the brass is a little hard to come by so I was wondering which would be easier and more efficient...necking down a 300wsm or necking up a 270wsm brass? And if its not to much trouble. Could someone justify why they would choose necking up over necking down.. or vice versa... THANK YOU!
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Old 03-25-2011, 08:16 PM
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Re: Necking up or down??

Necking down tends to produce better necks.

Factory necks are already too thin to give a good chamber fit.

Case are not suppported when pushing in an expander so the necks stretch to the thin/soft side. Necks are supported squeezing them down; that helps concentricity of the fininished necks.
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Old 03-25-2011, 08:25 PM
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Re: Necking up or down??

Necking up has a risk. The head stamp would show .270 WSM. If someone picks up one of your 7 WSM rounds and it says .270 WSM on the head stamp, that person might think it's ok to shoot it in their .270 WSM rifle. It will probably chamber. It probably won't have much clearance for proper bullet release (high pressure). And the bullet is .284 going down a .277 bore (very high pressure). Just something to be aware of.

-- gr8whyt
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Old 03-25-2011, 08:54 PM
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Re: Necking up or down??

In the case of the WSMs, if you neck up or down to a 7mm you will have to fireform because the 7mm WSM is about .050 longer at the shoulder than the 300 or 270.

I agree with others... necking down is better so you don't stretch your necks too thin.
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Old 03-25-2011, 09:18 PM
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Re: Necking up or down??

I've never necked anything up, but I do neckdown 8mm mag brass to 7mm stw and 30.06 to 270. You do need to fireform the cases but do it with a reduced load to keep from over stretching or spliting the necks and to get the right dimensions. If someone gets ahold of my ammo and uses it a 8 mag or 30.06 and it chambers , then they shouldn't have any problems other then poor accuracy and split necks. After downsizing check your oal of your cases before loading, trim if needed. I turn my case necks also to get the thickness down and even if needed. I've also been pondering if I should anneal the cases because I've overworked the brass, still kicking that idea around.

Last edited by mountainman; 03-25-2011 at 09:27 PM.
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Old 03-25-2011, 09:51 PM
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Re: Necking up or down??

sooooo.... i should basically just order some 7wsm brass from the internet and ask no more questions lol

Could someone explain fireforming to me in a nutshell. I have read some about it and everyone keeps throwing around that term.. but im actually still in the learning stage.
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Old 03-25-2011, 10:35 PM
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Re: Necking up or down??

If you were to size down the 300 case to the 7mm case like your asking about it will not have the exact shape of the factory 7mm case but it will chamber. so fireforming( shootform) the case by chambering the sized down, neckeddown case and shoot it to form it to the chamber and factory case shape. If you size a 300 case down to 7mm and compair it to the factory 7mm case you will see what I'm talking about. The cases wont be the same shape but very close, when you fireform or shootform the cases will be the same shape. It's really nothing more then shapeing the shoulder and squaring out the corners. It's very safe and easy to do, use a reduced load to make it easier on your brass and extend the brass life. After fireforming just check the brass lenght and trim if needed.
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