A few observations. Why would you dismiss the 6.5wsm as a barrel burner, and not the 6.8wsm? All these magnums from 6mm up to 7mm are all barrel burners.
On a second note: Long range shooting is just as much about wind deflection as bullet drop. These "lasers" that you keep mentioning are the easy part. Drop is consistent for a given range. I'll give you an example: I will take your load of a .433 g1 bc at 3400 feet per second, vs. a 6.5 caliber bullet with .612 bc at a fairly easily obtainable 3000 fps. At 700 yards your 6.8 will drop about 3.4 mils, and the 6.5 about 3.9. Either way at this range you will have to dial to compensate for the shot. How much harder is it to dial 3.9 than 3.4? But here is the kicker. The 6.5 only needs 1.0 mil of windage per 10 mph cross wind, and the 6.8 needs 1.3 mils. That is a difference of 8 inches. That means you have 8 inches more wiggle room on that deer. That could mean the difference between a gut shot or a miss on whitetail sized game. The difference only grows more between the two rounds as the yardage increases. You don't need a magnum case to get the 6.5's up around 3k either. Anything case with the capacity equal to or greater than 6.5x284 could reach those velocities without much trouble.
Personally, I would go with a 7saum, 280, 280ai or 7wsm. The bc's on 7mm's are even better than the 6.5's mentioned above, and they will obviously carry more energy onto the target.
Wind deflection is key in long range shooting, not drop. We have laser range finders, and scopes with turrets on them for a reason.
