my son was donated a buffalo hunt, some of you may have my other post, with lots of help and parts we have converted his handi to a thumbhole stock with a m-16 vertical foregrip he can hold, my current problem is loads for a 200 grain hot cor, ive tried 4895 from min to max and varget the same best groups are 4'' at 100 yards, way off for ar ifle that would shoot under 1'' with 150 nos BT any ideas, other post suggested 200 grain bullet min for buffalo,