I've found Hornady data to be conservative in some cases and not conservative in others just like the data from all the other manufacturers. Differences are due to different testing methods, different test guns, different powder batch/primer/bullets, etc., etc.
In this case I think Doug gave you only the starting load not the max. In Hornady #4 under 300 H&H Magnum for a 165 gr. bullet the starting load is 64.4 gr. of IMR 4350 (2900 fps) and max load is 70.8 (3200 fps). Actually it's the least "conservative" of the listed data.
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