Older thread, but, if any great 416 Taylor shooters are still on the lookout for good loads here's mine, I use CFE-223 for a true and safe 2400 fps in my 98 Mauser actioned 416 Taylor if one wants it.
Old school 400gr Hornady softs and solids along with the 400gr Partition.
One can start at 70grs CFE-223 and work up to what you and your rifle like, CCI-250 or FED-215 primers, have never seen a difference in accuracy, velocity or extreme spreads with either.
Proper head stamped cases for a traveling hunt from A-Square, Jamison and Quality Cartridge yield same results, as do necked up RP 338 Win Mag cases albeit a bit short.
Not even sure what action my rifle was built on, it has the British crown on the side of the action, it's plenty stout, feeds and functions like greased glass, it wears a 24 inch barrel, great and useful cartridge that could be included in the original short magnum cartridge lineup.