thanks for the response. I was trying hard to validate my method so that I wasn't committing a critical error.
fyi the "reduce by 1-2 grains" is as per both the Lyman and Sierra manuals. No percentages listed, unless elsewhere besides under 308 WIN.
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And you do not load according to the barrel length.
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I only included the barrel lengths because the lowest published loads came from the 26" test barrel, and assumed barrel length may have been pertinent in some way unknown to me.