I speak to the guy who lives in Siberia and is a guide for the bear hunt... anyway, we found some stats about handguns and bears (FMJ in all cases):
7.62x25 Tokarev (30 well documented cases):
21 case where shooting starded from 2 meters: 14 people killed the bear, no injuries, 4 got some injury, 3 died.
9 cases where people shot within 2 meters: 3 died, 2 injured, 4 killed the bear without injury.
The biggest bear killed with 7.62x25 was over 630 pounds...
7.62 Nagant (revolver) - 38 well documented cases:
30 started shooting from at least 2 meters: 16 killed the bear without injury, 6 got injury, 8 dead.
8 started shooting withing 2 meters: 2 dead, 4 injured, 2 killed the bear without injury.
I should mension that bullet couldn't go through the head and the most effective area was neck and chest. The biggest bear killed was over 480 pounds.
9x18 Makarov (28 well documented cases where 2 cases are from full auto):
2 cases with full auto handgun - no injuries, bear was dead right away.
19 cases from 2 meters: 10 had no injuries, 5 had some injuries, 4 dead.
7 within 2 meters: 3 no injuries, 2 had some injuries, 2 are dead.
Biggest bear = over 3 pounds. 9x18 was more effective than Nagant round, but not as good as Tokarev.
7.65 Browning (17 well documented cases)
11 cases from 2 meters: 4 had no injuries, 3 had injuries, 4 were dead.
6 cases within 2 meters: 2 no injuries, 2 had injuries, 2 were dead.
I should mention that 7.62 has been improved lately (since late 70s), but it sucks in my opinion.
9x19 Luger (17 cases):
10 cases from 2 meters: 7 no injuries, 2 had some injuries, 1 was dead.
7 cases within 2 meters: 3 no injuries, 2 had some injuries, 2 were dead.
9x19 was effective as 7.62 TT, but most ammo is improved today, so it should be more effective.
.25 ACP (12 cases):
8 cases from 2 meters - 3 had no injuries, 1 was injuried, 4 were dead.
4 cases within 2 meters - 1 was injuried, 3 dead.
.25 ACP sucks!
.45 ACP (only 9 cases - lend-lease wasn't so great as textbooks tell you)
7 cases from 2 meters: 6 had no injuries, 1 was injuried, nobody was dead.
2 cases within 2 meters: 1 had no injuries, 1 was injuried.
Those are stats for the last 80 years and since handguns are quite prohibited in Russia and were prohibited in USSR... the ammo is limited, but can give you some idea about it.