Has anyone tried reduced loads using cast bullets and IMR Trail Boss?

I use AA5744

I spoke to Mike Daly, Customer Satisfaction Manager, at IMR. He said that you can load any cartridge with Trail Boss to the bottom of the bullet base and call this the max load. Do not compress. Reduce it by 30% as a starting load. These are really light loads. I think the max load would be around 1000 fps. I will be loading the 458 Win Mag and .470 Capstick with Trail Boss shortly.

Hope this helps.