boltgun71 a 300WinMag usually pushes a 150 gr bullet at around 3200 fps, but can be as high as 3450 fps with the right handload. If you check the Nosler website, they stress that the max velocity for the 150 BT Hunting bullet is only 3000 fps. They are not designed for what you are using them for , and the results you write about demonstrate that point.
Yes, they will kill game very dead, but the wound channels and subsequent shock damage are tremendous. Your load may be appropriate for antelope at 400-500 yards, but it is certainly "overkill" for game under 200-250 yards. I have seen people shoot elk with these bullets, and IF we recovered those animals, the bullets were fragmented with erratic performance.
I would strongly urge you to go with the bonded, as it will perform much better, is little different in cost, and is as accurate.
Of course if you either like to throw away lots of meat, or if you prefer to pick copper and lead fragments out of the meat you do save??? Have at it.