I've searched the archives for loads for Barnes TSX and solids in the 458 Win Mag and have found very little information or discussion. The lack of data in the new Barnes manual is also sadly lacking.

I would appreciate hearing what others have worked up for the 450 gr Barnes projectiles.

Try Barnes website, they have current load data.

Thanks but I had already checked the Barnes site as well. The web site only lists two powders for each bullet weight. I'm sure there are a number of suitable powders including H4895 and H4198 plus others and no data is easily found.

You might try Quickload for a calculation with the components you want to employ. Then work up carefully.