Only bullets I ever had bad experiences with was a first gen 165 gr ballistic tip from a 30-06. Splashed on a shoulder. Never seen the deer again. The other was a Sierra Game King from a 243. Hit a rib and did an odd deflection but I did find the deer after a good distance so not really a failure.

Good experiences? My absolute 2 favorites are the 120 gr BT from a 7-08 IF kept below 2900 or so. I usually use 44 gr of Varget for those. The other is whatever bullet Federal uses in the blue box 270. That was almost all I used before I started handloading. Triple digit kills with them and they never let me down. Ive bought a slew of them pulled and load my own with them now... still kill like lightning.