168 gr Sierra Match Kings and IMR or H-4895;
175 grain Sierra Match Kings and Varget or AA2520.
Frankly, best accuracy often comes at or near the maximum, so follow all that boring fine print about starting loads and working up.
If you cannot get at least reasonably good accuracy somewhere in there, something is wrong. Yes, you can fiddle and diddle and optimize for your rifle but the above components cover a large percentage of match rifle ammunition so it has to average pretty good.
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