Re: 600 yard hunting rifle????
CLW, My three Tikka's are in the three cartridges you mentioned. 338 win mag, 300 win mag and 300 wsm. All three shoot awesome and are a pleasure to carry hunting. I wouldn't have a problem shooting animals at 600 yards with either of them. I hunt in grizzly country most of the time so the 338 gets the most attention.
Predictions are difficult, especially when they involve the future