Mid twenties of Red Dot would be a very safe starting point. If heavy shot loads or high velocity are desired, a slower powder than Red Dot would be called for to keep pressures under control. The 12 gauge data you mention starting at 18.X grains is with good sealing plastic wads, not paper wads. William Davis is correct. 12 gauge data is usually, maybe always, safe in a ten gauge, but we're talking paper wad data from the sixties. Modern 12 gauge data is lighter than it needs to be if we're loading it in ten gauge cases. Red Dot data for 1200 fps loads in the paper wad era was 23 grains, gravitating to less than 19 grains today.
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