misplaced my load data for 250g lead or copper plated bullets. I'm using Hodgen 4227 or LilGun powders.

You can go to Hogdon's web site and get whatever load data they have available.

go to sierra,hodgdon,cast performance,hornaday,Speer sent me the new published info that's been changed because the data was developed using Freedom Arms cases in a crusher pressure barrel supplied to speer by Freedom.The new industry pressure standard for the 454 is now transducer- based and the cases are not the same as the now discontinued freedom brass.Cases are now being sold by Winchester & Starline and the pressure is a whopping 65,000 psi,the same as many of the most powerful rifle cartridges:For load data contact Speer techs and they'll email you the info sheet.I use H110 & W296