Agreed Sir Ron, funny driving band locations for max efficiency in the 458 WM+, lever gun yes, and even some slow [20] twist double rifles, the 400 safari solid would be perfect as iirc most of the .458 cal 480gr Woodleighs which are a Kynoch bullet copy externally with BOL's of 1.240-1.310"...............the 400's at 2250 ish should punch a respectably deep hole provided regulation is there.
Maybe the men at Hammer will see to it that a proper 400gr solid comes to light.
