Originally Posted by TRexF16
Originally Posted by alwaysoutdoors
Is there any reason not to rebore a Winchester model 670 .243 into a 358 win. or 338 fed ? I have an itch for one and leaning toward the 338 federal.

I think the general rule of thumb is to preserve at least .100" of barrel thickness around the bore. So for a .358, your .243 barrel needs to be at least .558 at the muzzle. That's about as small as anybody sells - matches the featherweight profile, so odds are you're fine - just take a measurement. If yours is a touch too small the .338 would probably still work.

Cheers,
Rex

Thank you

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