Never mind on this. Hornady sent this response to a request for load data.
Thank you for your inquiry. Unfortunately we do not have data for the 225 FTX in the 444 Marlin. This bullet is not capable of handling the higher pressure of the 444 Marlin. The bullet will most likely rapidly expand and fragment upon impact.
I loaded some up to try in the Thompson Contender 44 Mag this afternoon.
