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7mm/378 Weatherby 35 degree shoulder

 
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  #1  
Old 01-22-2008, 09:25 PM
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7mm/378 Weatherby 35 degree shoulder

Done anyone have one or know anything about them? I see that Z-hat chambers it, but thats about the only information I can find about it. I wonder how it would compare to the 7mm Allen Mag, STW, RUM? I e-mailed Z-hat, so if they get back to me I'll post what they say.

Adam
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Old 01-23-2008, 10:21 AM
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I'm pretty sure that it would have a little bit more capacity than the 7mmAllen mag which is a bit more than the RUM a good bit more than the STW and unless your using a VERY long barrel you woulden't get any more velocity , that is way more powder than can be burned in the 7mm bore and Weatherby's soft brass will prevent you from pushing it to hard so realisticaly you will likely be able to get more speed with a 7mmAllen mag.

It seems like alot of wokk fireforming the brass which is very expensive and doesn't last that long fo no real benifit.
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Old 01-23-2008, 03:47 PM
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Although I would be very worried about bore life, I guess there may be some application for such a cartridge.

To see any performance enhancement over smaller 7mm cartridges I think that you would need a very fast twist which would accomodate bullets that are particularely long & heavy for the .284 bore diameter. A 200-250gr bullet and a very long barrel to propel it would make for an interesting LR combo.
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Old 01-23-2008, 07:11 PM
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"I guess there may be some application for such a cartridge"
I'm not pickin up on what it could be, after fireforming and barrel break-in it's time for a new barrel.
UB
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Old 01-23-2008, 07:39 PM
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I'm not really understanding how fire-forming it and the Allen Mag are different? How is it so much worse with the 7mm/378?
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Old 01-24-2008, 12:27 PM
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If your were fire forming with a good cream of wheat load their would be very little to no barrel wear and with well thought out loads you could fireform with very little barrel wear. But as with any time your fire a round of anything their is a chance or probablility of barrel wear.

If I were going to have a big over bore mag like the 7mmAllen mag I would send the extra money and have a cheap $89 Adams & Bennit barrel chambered for the same round and use that for a brass forming barrel.
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Old 01-24-2008, 07:39 PM
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Quote:
Originally Posted by James Jones View Post
If your were fire forming with a good cream of wheat load their would be very little to no barrel wear and with well thought out loads you could fireform with very little barrel wear. But as with any time your fire a round of anything their is a chance or probablility of barrel wear.

If I were going to have a big over bore mag like the 7mmAllen mag I would send the extra money and have a cheap $89 Adams & Bennit barrel chambered for the same round and use that for a brass forming barrel.
James I believe that is an excellent idea. I think they run around $80 and would sure help extend the life of the "shooting" barrel.
For it's intended purpose it wouldn't even need to be blued.

James
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