I called Hornady and asked them if they had load information on 2400 and the 240gr XTPmag but no luck only had it for there 200gr FTX. I have loaded 31gr of 2400 behind the 240gr but I am sure it is not max load. Alliant shows using 36 behind a 300gr bullet also.
When I run out of 2400 I will just stay with 296 probably and may try Trail Boss for light stuff.