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Necking down cases ...

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  #1  
Unread 04-27-2003, 01:18 PM
dwm dwm is offline
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Necking down cases ...

I have factory 25-06 REM and 7mm SAUM rifles.

I was thinking of using 270/30-06 and 300 SAUM brass and necking it down so the case necks end up thicker therefore fit the factory chambers better.

I have a couple of questions:

1. Should I start with 270 or 30-06 brass for the 25-06?
2. Can I just run 270 or 30-06 brass through the full length die and get 25-06 brass?
3. Can I just run 300 SAUM brass through the 7mm SAUM FL die and end up with 7mm SAUM brass?
4. How do I determine the actual neck dimmensions of the factory chambers? I will need to know this so I know how far to turn down the newly formed brass.
5. Do I need to make a chamber cast? Is this hard to do, etc, etc ...
6. Is there an advantage or disadvantage to having thick brass in a case neck? I know most competition tight neck chambers end up with thin brass on the case necks.
7. Are there a books I should be reading that discuss all of this? (Might keep me from asking so many questions.)

As usual, an insight that you guys are willing to share would be greatly appreciated.

Thanks,

Doug
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  •   #2  
    Unread 04-27-2003, 07:47 PM
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    Re: Necking down cases ...

    On the 30 to 7 SAUM at least, I think you will find that the growth will be in length, not in thickness.
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      #3  
    Unread 04-27-2003, 07:49 PM
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    Re: Necking down cases ...

    PS, the 30rsaum is .020 shorter than the 7mm so you better hope it grows!
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      #4  
    Unread 05-05-2003, 05:10 AM
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    Re: Necking down cases ...

    DWN-Keep in mind that thickening the brass inhibits sealing the chamber properly causing other issues. If you load your rounds into the rifling you will find case neck fit to the chamber irrelevant!!! The only thing about the case neck I worry about is concentricity and keeping them soft by annealing. I have a Ruger in 25-06 with probably the biggest chamber on earth and it shoots fine when loaded into the rifling. In fact it shoots quite amazing groups with 115gr Berger vlds and 55grs Re22. Necking down as I have tried only causes major concentricity problems!!! I also like the Hornady dies for sizing because the collet style holder for the expander ball holds on center better. This holds the neck concentricity to better tolerances than the other dies that I have used. Oh those Bergers were moly coated-don't want to see you have pressure problems if you try them.
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    Unread 05-05-2003, 05:13 AM
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    Re: Necking down cases ...

    oops sorry for the typo DWM on your name. I get unwound when thinking of the neck woes with the 25-06.
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      #6  
    Unread 05-05-2003, 06:43 AM
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    Re: Necking down cases ...

    dwm,

    I would agree with H-BAR that you should try loading your rounds close to the lands.. That will more then likely solve your issue..

    H-BAR

    I noticed you are using Hornady dies for 25-06.. I have a set of Hornady dies for that caliber as well but I am having major problems with getting stuck cases in that dang die.. I have been reloading for roughly 12 years if not more and never had a stuck case.. I bought those dies becouse i heard great things about them but no matter what i try, little lube, no lube, alot of lube I even went as far as tearing the die apart and cleaning it after I run 2 through it which is a pain.. But no matter what i try i still get a stuck case.. You have any issues with this? You happen to have any "secrets" on how to stop this or should i be callin Hornady.. I have written them a email about it but havent gotten a responce back..
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      #7  
    Unread 05-05-2003, 06:56 AM
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    Re: Necking down cases ...

    DWM

    The last time I looked, the 270 brass is 2.540" long and the 25/06 or 30/06 brass is 2.494".
    You will "have to" cut the length back .046" to make it work if you use the 270 or 280 brass for your 25/06. [img]images/icons/wink.gif[/img]

    Just a thought.
    DC

    [ 05-05-2003: Message edited by: Darryl Cassel ]
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