45 Cal 275-300gr revolver bullets

Dan:
Would like to order, if possible some 260-290 gr 45 Colt bullets sized to .452.
These are for both a Ruger NM Black Hawk and Colt New Service. A bullet of
275 gr would be best, no GC needed because velocity would not exceed. 1050  FPS.
Wonder if a Keith styled SWC could be created? 15 to 1 lead alloy or alloy best suited to
non-leading and throats of .451.5/.452

Thanks;
LTC Ridge Marriott