REALITY STRIKES HARD
In your gun...............
You may NOT extrapolate data ever ever ever; you must test.
Highly recommend W296, H110, or N110 for 44 Mag.
Do not recommend non-sense loads through S&W.
Based on your chart I'd stop at 19.5g 2400. Do NOT ASSUME that the XTP will perform the same as lead; you'll need to work UP again.
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"all my ammo is mostly retired factory ammo"
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