For me - - -> hunting with a X39 would be a reloading "must". There are some good factory loadings out there but to gain the full potential of the chambering,I would load my own.
I would never attempt to use Tula or any of the steel cased stuff. Even the HP,lead nose,and others, are said to perform more like a FMJ.There are too many great bullets out there to have to go cheap.
Your factory choices are pretty much between 121 and 124grs. To me,that is a perfect weight given the performance as far as velocities. There are a couple of 150gr offerings but to me that is unneeded weight and excessive loss of trajectory. Pick the right bullet and the X39 can be a great closer range killer of hogs OR deer. --- SAWMAN