About 15 years ago I had a post 64, 308, 88 rebored to a 338-08 by the combined team of Nickles and LaBonty.
Back then there was not a 338 Federal, but my handload I sent them was so darn close to a 338 Fed, that it feeds just fine (although my handloads are more accurate)
The bottom 99R is a 358 so I have the best of both worlds.
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"The older I get, the better I was"