Isnt that one of the big issues? The twist rate?
A couple of heavier projectiles but vast majority of 270s twist is marginal for them
Ice found the same thing researching for the 264win mag
Standard is 1-9 but the later long range projectiles need quicker which ironically slower calibres like the creedmore do have the quicker twist which gives makes them ballistically better a long way out even though they are up to 300fps slower
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