I realize that this thread is a few years old, but I can't resist the urge to reply. I didn't read every page so if this was covered I apologize for wasting your time. In my opinion (personal and professional) one rifle for all missions is not the best way to go. Most situations dictate the need for at least 3 different operational platforms, depending on the mission and/or target.
When operating as part of a squad or attached to a platoon, in an urban environment, most sniper shots will be under 500 yards and the opportunity for multiple targets is very possible. For this mission I would choose to employ a flat topped AR10 type weapon chambered in 7mm SAUM (or even 7-08) and pushing the 162 gr A-Max or SMK through a 26" barrel. I would top off the rifle with a 3.5-10x40mm Mark4 scope (or one like it).
I did not choose the VLD type bullets because they are too sensitive in
terms of seating distance from the lands. When fighting in relative close proximity with the enemy, things can get rough. Besides, Marines aren't known for being delicate with any type of gear (we leave that to the Air Force).
When operating in pairs, or when attached, and targets are expected to be at further distances and a single exposed target is the objective, I would choose a rifle like the Surgeon Scalpel. It would be chambered in 7mm SAUM, pushing a VLD style 180 gr bullet through a 28" barrel, and topped off with a 4.5-14x50mm Mark 4 type scope.
I picked the Surgeon rifle because the Surgeon action is a much better "twin" to the 700. The action has a intergrated recoil lug (extra threading for a stiffer barrel) and intergrated picatinny rail (increased strength, stiffness, and no screws to come loose or break). This type of mission is better suited for care of the ammo and the increased BC of the VLD bullets. This rilfe would not be the only weapon carried by the sniper on this mission.
When the target is at greater distances or is protected by some type of minor obstruction (vehicle door, body armor, or another person) I would choose the Surgeon Remedy rilfe chambered in .338 Lapua or .388 Edge. It would have a 30" barrel, push 300 gr SMK (or similar bullet), and top it off with a 6.5-20x 50mm Mark 4 type scope.
One important thing that most people don't think about is the report of the rifle. I'll spare you the long version, but basically the loulder the report of the rifle (.338's and bigger) the easier it is for the enemy to determine the origin of the shot, especially under 1000 yards. This may not be important, until they blanket the area with mortar rounds or send a platoon to take out you and your spotter.
All of this is assuming that I
would be paying for each rifle. If the "powers that be" would pick up the bill I would probabily only change the optics.
I would be hard pressed to pick just one rifle for all applications, each mission dictates what weapons are need. Hope I didn't bore you too much.