I don't have any experience with the 300 WSM, but I have a 300 win mag in a Browning A-Bolt and the 180 gr. bullets have worked great. I've been shooting the Federal 180 gr. Nosler Partitioners and had great success with them. I reload for most of my guns, but I took this gun to Africa with me last summer and they told me it wasn't a good idea to bring reloads, so I picked up a box of the 180 gr. Federal ammo and it shot great. In Africa, I took a Kudu, Impala, Blesbok, Zebra, Gemsbok and several warthogs. A friend of mine used it on the same trip for the same animals. All were one shot kills. They either dropped on the spot, or ran less than 100 yds. Most of the shots were complete pass throughs. I haven't hunted Black Bears yet, but I wouldn't hesitate to use the same set up for them as well. I doubt they would be any harder to take down than some of the animals that I took in Africa. FYI, I brother-in-law used a Kimber 300 win mag for the same trip. The 180 gr. Partitioners in the Federal did not shoot worth a darn in his gun. He used the 180 gr. Winchester Accubonds and took pretty much the same animals as I did with the same results. They worked great as well.