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7-08 to 243 back to 7-08

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5 comments

  • Mobuck
    I'd say this would require annealing and still maybe not last too long. Best leave them as is and get some more 7mm08 brass.
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  • BGHillbilly
    +1 on leaving them as they are.
    I would not try to go back up. I never was happy with the results of necking down 7mm-8 to 243. I had a 7mm-08 and a friend had a 243 and it just seemed to work the brass way too much. I expect if you tried going back up you might get to reload them once or twice after fire forming them. Figure a primer, powder, and bullet to fire form problably cost more than some once fired 308 brass.
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  • Riomouse911
    That's lotsa work on the brass...I'd just sell the remanufactured .243 brass and buy some 7-08 instead.
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  • JustC
    annealing would maybe make it OK,.but prolly not for long.
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  • sandwarrior
    bsdoyle,

    There is more at issue here than just the necks. A rule I've made for myself is "Never resize brass to more than two different rifles." i.e. I pick up some once fired brass, re-load it and fire it in my rifle. That is two rifles. I won't re-size that to another rifle, even the original. I've had too many incipient case separations. And, I'm a bit leery of having any more.

    That said, if all the brass had was necked from .284 to .243 and not trimmed, or turned, then anneal and re-size back to .284. If any of the above was done, such as firing, turning, or trimming, just go get some new 7mm-08 brass. It's much simpler and safer.
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