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Old January 13, 2007, 02:43 PM   #1
dirty habit
Join Date: December 18, 2006
Location: New Zealand
Posts: 57
7mm08 from 308

Hi, Just wondering if anybody out there knows how difficult or easy it is to form 7mm08 brass from 308? Is it a better idea to buy 7mm08 brass or reform?
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Old January 13, 2007, 04:18 PM   #2
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It's as simple as lubing well, then running the .308 empty into your 7-08 full length sizing die. HOWEVER you will end up with a 7-08 casing that's shorter than a standard 7-08 by as much as .020. That's because the .308 is 2.015 and the 7-08 is 2.035 trim length.

In the real world, that's not enough to be worried about, there's still plenty of neck to properly grip a bullet. Another thing that CAN happen when necking down, is the neck becomes thicker. If you are dealing with a tightly cut match chamber, it could result in no room left for expansion of the neck during firing, even preventing chambering in a worse case scenario. A standard sloppy factory chamber probably won't know the difference.
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Old January 15, 2007, 03:57 PM   #3
Peter M. Eick
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It is easy to do, but be careful to work up your loads carefully. The only blown rifle round I have fired was a 308 that ran though the 7-08 dies and was shot on a hot day. It perfed the primer and sent a bit of gas back my way.

For this reason I will never own a 243 since it is hard enough to keep the 7-08 out of the 308 brass....
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