A 250AI works too, but I haven't tried it on yearling bears....
Unfortunately I have, and the 25cal 100g partition kills the little ones just fine. It also kills 280 pounders just fine too. I have also used 200sp from a 358 on two and 225nps on one. I can say that I haven't noticed much difference between the terminal performance between them. all five bullets exited just fine and 4 of the bears were DRT the other went maybe 15 yds. Other than the yearling, the bears were 175-280lbs so no monsters.