The load data you have for the Hornadys will probably also work very well with the Game kings. If it's near the top I'd back up a little and work up to it. I do know that If you don't mind trying a different powder that IMR 4350 has been the cats pajamas for me with the 165 Game Kings. I use neck sized Winchester brass, CCI BR2 primers, and work up to a near Max load of 57Gr. Results for me have been stunning and it's considered by many as a go to load for the 30-06.