I only use the Hornady 240 XTP MAG for full power loads, over 45.0 grains of win 296 as per hogdons web site and I get 1917 FPS from it. For medium power loads, I use A 5744. Accurate has a pdf with load data. I use it for loads around 1400 fps. For 1200 or less, I use trail boss.

I have tried a number of loads in my 460 x frame and have chronographed many of them. What are your goals?

I just shot some 200 and 225 grain speer bullets on Sunday. One of them was called the "flying ashtray." I loaded them over 38.0 grains of 5744. I didn't chrono them, but they shot fine and seemed accurate to clay pigeon at 75 yards.

A 240 grain sierra jacketed bullet over 33.0 grains of 5744 = 1265 fps. The same bullet over 38.0 of 5744 = 1431.8 fps.

5744 is safe to download, but will leave unburned powder. The granules fall out of the chambers when I eject the brass. It will also push the bullets almost as fast as 296, according to Accurate data.

Trail boss works with any bullet in the 460, both jacketed and cast lead.