RE: 338 Win Mag or 300 Weatherby
If you have the time to practice and the skill to make those 400-500yd you mentioned I would probably go with the 300Wby over the 338. The flatter trajectory of the Weatherby would take some of the guess work out of those long shots. If you had a 300yd limit then I would back the 338, hard to beat those larger, heavier bullets from 300yards and closer..