At 1060 fps, the 350 grain bullet still has nearly 900 foot pounds of energy. If you are looking to insure penetration, perhaps the heavier bullet, 400 or more grains will get the job done. I have also used 420 to 440 grain cast bullets with black or substitutes at 1200 1400 fps that passed all the way buffalo, and were not recovered. I'm accustomed to a pretty rainbow shaped trajectory and the challenges it provides. At under 1100 fps, range estimation strikes me as a daunting task in the field. A heavier bullet would also help the bullet keep what velocity it has over a longer range.