Our family has 3 300WinMags for long range deer and elk and have used the 180g NBT exclusively with good experiences in both accuracy and performance on game.
Granted those velocities could be higher than those generated by a 308 but at the longer distances that we use them for the velocity has dropped down considerably.
I've used 40g NBT in an AR on deer here in Idaho that are moving out very fast. Of the deer taken to date the greatest distance traveled after impact has been about 35 yards. The NBT has a very thick base and penetrates very well as velocities slow down.
Granted those velocities could be higher than those generated by a 308 but at the longer distances that we use them for the velocity has dropped down considerably.
I've used 40g NBT in an AR on deer here in Idaho that are moving out very fast. Of the deer taken to date the greatest distance traveled after impact has been about 35 yards. The NBT has a very thick base and penetrates very well as velocities slow down.