i load a 300 grn xtp for my marlin,i am not sure how well it will feed in a bolt gun,but they work real nice out of a lever.i use h335 powder,i don't recall the load but i remember the velocity to be chrono'd around 1950,that bullet performs very well and retains good mass.i use the 240 grn in all my 44 mag deer loads.good luck with the project,adker