Different manuals list different loads based on using different bullets, primers, cases, and test chamber/rifle. Pick one closest to your components and begin with starting loads.
Varget is a great powder, especially for medium loads used in M1 Garands or older rifles (150 gr - 168 gr bullets). H4895 is a versatile powder especially for reduced loads. Both seem pretty consistent and reliable.
Slower powders are probably better for heavier bullets, or faster velocities, but I don't load for them.
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