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25/7mm Mag data?

 
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  #1  
Old 10-13-2009, 05:59 PM
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25/7mm Mag data?

Hey there;

I bought a rifle for my Dad, and I need some reloading data for it. It is a 25/7mm Mag. I just need a place to start....

Thanks!
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  #2  
Old 10-14-2009, 02:58 PM
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Re: 25/7mm Mag data?

Which 7mm Mag? Rem Mag, WSM, Rum, STW, RSAUM? Try the link below, it could be a start.
Dave

The Rifle Section @ www.reloadersnest.com
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  #3  
Old 10-14-2009, 07:10 PM
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Re: 25/7mm Mag data?

Sorry for the confusion. It is a .25-7mm mag., that's a 7mm Remington Magnum necked down to .257 caliber. It's a wildcat cartridge. It should be very accurate (with the right load), scary fast, and with the new, high BC bullets out there now, should fit my Dad's desire for a light recoiling semi-long to long range rifle for coyotes and pronghorns.

The problem is, I don't have the time to start loading/chronographing from scratch, and was hoping someone else out there had played around with this one.

Thanks!
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Old 10-14-2009, 07:19 PM
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Re: 25/7mm Mag data?

Sounds very similar to Weatherby's 257 Mag. You probably don't have the Weatherby freebore in your rifle but using 257 Wthby starting loads should be a safe starting point.
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Old 10-14-2009, 08:32 PM
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Re: 25/7mm Mag data?

The 257 Weatherby and the 7mm Rem Mag both have a case capacity of 80 to 81 grains of h2o, so it you used 257 Weatherby data and reduced by 10% to start, you should be safe.
Dave
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Old 10-14-2009, 09:29 PM
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Re: 25/7mm Mag data?

Thank you very much!!! I don't know why I didn't think of that...I used to have a 257 Wby! I guess I deserve a "DUH" for this question.

Thanks again!
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  #7  
Old 06-08-2010, 10:38 PM
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Re: 25/7mm Mag data?

the 257 wby, 7 mag and 264 is all the same case just Roy rounded the shoulder & neck points on his.
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