That load should put the 265 in the neighborhood of 2100 fps or so depending on your bore condition, barrel length, etc. At 2100 you would have a muzzle energy of approximately 2500 ft lbs, a Thorniley of 150, and a Taylor KO of 34. This would give your 444 the capabilities (within its useful range) of the .333 and 350 Nitro Express (rimmed or flanged), The 350 Rigby Magnum, the 360 Nitro Express No. 2, and the 9.3mm Mauser. According to the "numbers" it would be suitable for everything in North America as well as larger African plains game.