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Old November 29, 2019, 03:04 PM   #4
T. O'Heir
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Join Date: February 13, 2002
Location: Canada
Posts: 11,864
The RL19 180 grain data on Alliant's website calls for a 76 grains MAX load. You must work up to that from the Start load(76 minus 10%) and do not just pick a load and hope.
Velocities are out of a 24" barrel with no twist given. That probably was a test barrel.
It doesn't matter what Speer or No$ler did. All manuals give averages of data collected, using the exact components and environmental conditions on the day of the test only. You're already using a slightly longer barrel so the velocities will be different anyway.
"...Are the bullet shape and dimensions the same?...Are the alloys of the jacket the same?..." None of that matters. You load for the bullet weight. Not the shape or jacket material. And a ladder test proves nothing about a particular load.
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