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Yes it is. Use the Start-level loads, and work up to no more than halfway to the Max ones.
Generally speaking, Start loads are right at 10% less than Max (regardless of the actual charge) so you can work in the range of 90 to 95% of Max.
Maximum pressures are lower than the .308 due to the slightly weaker actions (even with the reinforcing that was done to Winchesters) than the .308 is used in.
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