Add Accurate 4350 to that list. My beloved '06 does very well with IMR 4350 & AA4350.
I start with the Lyman manual - up 1gr from lowest charge of a particular bullet. Load in groups of 3 to test.
150 Sierras and Nosler Custom Comps are pretty easy to load for. I use those for general practice / plinkage.
For more serious shooting - I use 168's 175's 180's and 200's with 4350. The IMR and Accurate are about 2 - 3 10ths of a grain different in loads.
No complaints.
PS - Of course you've eliminated as many variables as possible, correct? Things like, scope is tight, shooting off a bipod or bags not touching the barrel, floated barrel, bag under the rear, no wind, sunny day, no women yakking while you're lining up a shot, etc...
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