Squints: According to your original post and second post, you want the ultimate handgun for deer, bear and elk out to 200 yards.

IMO the 300 BO is not a 200 yard elk cartridge, and I don't know about a bear at 200 yards, either. Some of those big blacks weigh 3-400 pounds or more with a lot of body fat.

I like what Chance said about the .460; IMO it may be the best solution of the calibers mentioned for deer, bear and elk out to 200 yards, per your requirements and your state's requirements.