The bullets I have used are:

270 Winchester 150 grain Core-Lokt Round Nose 1 bear
375H&H 270 grain WW Power Point. 2 bears
45-70 400 grain RCBS cast 1 bear
44 magnum 250 grain Keith SWC 3 bears
44 mag 320 grain LBT 1 bear
44 mag 265 grain Hornady 1 bear
454 Casull 370 grain LBT 1 bear

So far i have not recovered a bullet from a bear. All were 1 shot kills.

All dropped pretty soon after the shot except one, which was a mid size bear I shot with my 375 about the center of the body as it went away from me. Bullet exited in front of the off-side shoulder and that bear ran about 75 yards. Easy to follow the blood, but I was surprised how far it ran.

One I killed with a 44 mag with the Keith SWC ran, but only about 25 yards and then fell to it's side and started thrashing the ground and brush. It died soon after that.

The 45 70 bear ran only about 20 yards but left no blood for the first few yards which also surprised me. It was in berry bushes and so it was real hard to go after it. It took me a few minutes to find the blood, but once I did it was an easy trail to follow but for the thorns. I drug it out with a mule and a rope.