I currently use Federal 180 grain Nosler partitions in my 300 WSM but was thinking of trying the Federal 180 grain Nosler accubond and was wondering whats the difference between them? I'll be using them for PA black bear and whitetail

Either one would work great, I've used the Accubonds on everything from elk to antelope and it always put them down on the spot in my .300 win mag.

If you're already using the Partitions, you really wouldn't be gaining much (if anything) by switching to anything else.

If the Partitions shoot good for you, I'm not sure I would change. I've tried unsuccessfully to get them to shoot well in several of my guns. When I switched to the Accubonds, I got the accuracy I was looking for. But lots of others have had good luck with the Partitions. I actually think the Partitions are a better bullet for your intent.