Based on the cartridge volume available for powder (74grns) the most N135 powder I can squeeze into with the 265grn FTX is about 46 grains which according to quickload may yield about 1890 FPS. Before I go to that point I will start much slower and work up.

Further before I start playing with 265 FTX I need to complete working out the best load for the 240grain bullet to include testing out some other powders than just the N135 I am currently working with.