6.5 RWS 6.5 Rem Mag or Weatherby RPM
Mark and Sam did a feature on comparing 6.506AI vs 6.5 Saum. Same barrel, powder load, case capacity. Saum smoked the 06 with the only explanation that Sam could find was a more efficient case at a guess.
My own thought is that with heavier bc bullets the 06 needs a really long barrel, but that is only a guess
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