I'm shooting the 300 RUM in a semi-custom Rem Model 700 Sendero with a Douglas 28" 1 in 10" twist barrel. I have a great load worked up using the 215 Berger Hybrid bullet that has allowed me to take two nice whitetail bucks the last two years - one at 586 yards and one at 634 yards both one shot DRT. While this bullet has performed exceptionally well on whitetail deer I realize it might not be the best bullet for larger and heavier boned game such as bison which I may have an opportunity to hunt later this year. I was thinking about working up some loads using either the 200 grain Nosler Accubond or Partition. Would these bullets be better than the Berger for bison or would you guys think the Berger would be OK? I don't expect the ranges to exceed 300 to 400 yards. Any advice is much appreciated. Thanks in advance for your help.