I have had pretty good results with using the Lyman book, find the overall range of a particular powder & start right in the middle of that range. then, go 1 or 2gr in each direction (up1 or 2gr & down 1 or 2gr) from the mid point. In almost all cases, I have found the sweet spot by going in .5gr increments. Sometimes I even use .4gr or .3gr increments.
I can wholeheartedly appreciate the need to find the sweet spot without running thru 1/2lb of powder. It do get expensive!
Now, this has worked for me with .308", .277" & .257" bullets so far and about 8 to 9 times out of 10 I have stumbled upon that all elusive accuracy node.
But that's my rifles. You might do better.... or worse. Maybe some of the BR & 1000yd guys will chime in and have a better idea. They've been thru most of these procedures already.
Good luck with it.
Frank in Fla
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