Im not sure about your powder being temperature sensitive.as im just starting to reload but i can tell you that your point of impact should “NOT” change with magnification change. Unless you have a very old scope that is tracking when you adjust the zoom. or a broken scope. I have a new 100 dollar cabelas scope on my old hunting rifle and it does not change with zoom. Thats the whole point of being able to zoom your crosshair stays zero. If you have a bullet drop reticle that will change with zoom but the center point of aim will not. Try some factory ammo with same grain bullet. If your point impact comes up (obviously the point impact wont be the same as your handloads) then id look at your powder. If it shoots low then id look at your scope.
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