Looking at the latest Hornady manual (#8), The best powders for that bullet weight are IMR 4064, 4320, Win 760, VV N-160, H4350 and IMR 4831. H414 is not listed for the 70 grain.
The Sierra #5 manual shows Varget and 760 giving top velocity. 414 not listed. Powders listed in Hornady manual also showing as acceptable in the Sierra manual.
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