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Try these...
I did some OCW (optimal charge weight) testing using Sierra's 168 grain Matchkings and IMR 4895. The conclusion I came up with was that the maximum charge of IMR 4895, 43.6 grains of that powder, drove the 168 grain Sierras very consistently. I used Winchester brass and Federal 210M (Match) primers.
Check for pressure signs at 42 and 43 grains before going to the 43.6 grain charge.
Now for Varget. Varget is doing really well with the 168's and 165 grain hunting bullets with high density charges. It is also very important to use CCI BR primers with the Varget powder for the highest level of accuracy. 46 grains of Varget should drive the 168's at about 2600 fps from the 20" barrel, perhaps even a little faster.
Finally, 42.8 grains of RL15 does a decent job with the 168 grain bullets in my experience.
Let us know how things go, and work up to the above powder charges carefully, watching for pressure signs.
Dan Newberry
green 788
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