ORIGINAL: stalkingbear
The .308 is PLENTY gun for any black bear or moose walking the earth. All it takes is good shot placement and a well constructed, premium 180 gr bullet. I wouldn't feel undergunned at all. The magnums that everybody likes so much only make a difference at longer ranges where a flatter trajectory is important.
I agree with stalkingbear - 180 gr bullet that is well constructed for moose. You wantthe bullet tohold together and penetrate vs. breaking apart if it hits heavy bone.
IMO, I would not go above 165 gr for deer. A 180 gr will do the job on deer, but not as well as a good 150 or 165 gr(where the major shock wave takes place is important).
I have not hunted black bear, but I don't think I would go below 165 gr. You can always call the ammunition manufactures and ask what they recommend.