Rifle: BRNO ZKK 601 .308W.
Bullet: 150 gr Hornady Interbond.
Muzz.Velocity: 2,800 ft/sec.
Distance: 262 metres (290 yards).
Impact Vel.: +- 2,250 ft/sec.
The bullet demolished the first shoulder, passed through a rib, passed through an opposite rib and stopped in the opposite shoulder. The bull flung itself around in a tight circle and fell down dead close to where it was shot.
83% Weight retention.
Perfect impact velocity for best penetration. A successful one shot kill as the lungs around the heart were severely damaged and the top of the heart was cut.
Critical Review: The low impact velocity ensured that the released kinetic energy into the carrier of the KE (the bullet) was low enough to not allow catastrophic deformation of the 150 gr mass. Had the bull been 160 yards closer, impact velocity would have been 2,580 ft/sec, expansion would have been considerably more, weight loss would have been more and penetration measurably less - still a high probability of going into the heart but not through an opposite rib and into the opposite shoulder as one would like to have.
This was good performance but shows the limit of a 150 gr. bullet on big game - higher impact velocity would have resulted in more weight loss and less penetration. The hunter knows the trajectory of his rifle and these bullets very well - which was the reason for his choice. I would develop the same confidence with a 168-180 gr bullet.