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The ackley has slightly more powder capacity than the 458 Lott, so using Lott data is a good way to go, you'll be down a tad on velocity and pressure, so it is safe data to use, and much easier to come by.  You can also use Hornady 458 basic brass to form your hulls.  I've found RL 15 and Varget work well in the 458 Lott, though they are compressed, and would likely be better in the slightly larger ackley case.

The A-square manual has data, but it's limited to their 465 gr bullets.

Message Thread:

• .450 Ackley mag plumber Jan 25 2006
  • 458 Lott data Paul H Jan 26 2006
  • Curious Snowwolfe Jan 25 2006
  • 450 Ackley loads.... Murphy Jan 25 2006
    • .450 ackley plumber Jan 25 2006
      • Ackley plumber Jan 25 2006
      • .450 ackley plumber Jan 25 2006
        • Mine Snowwolfe Jan 25 2006
          • Brass Snowwolfe Jan 25 2006