I have a 270 in the browning a bolt. Mine is not synthetic, so this might not apply. I love the way it shots, but think it is a little heavy (agian it is wood, Im sure the synthetics are much lighter). Very good gun. I have a weatherby in synthetic 300 wby. I love it as well. Never shot a sako. I dont think you will go wrong with any of your choices. Go to a gun store and play with them. See which action you like the best. Only advantage I can think of among those choices would be that the Mark V is very easy to adjust the trigger setting. You dont have to pull the gun appart to set it. Just two simple screws.