UrbanMan was asked a question about the necessity or priorities of having a "sniper" rifle as part of a Survival Battery.
I think you have to consider alot of factors first:
1. What are your other firearms in your Survival Battery?
2. Are to going to be soley operating and surviving in an Urban environment? What are you expected engagement ranges?
3. What is your experience level with firearms and especially scoped firearms?
If I did not have a Battle Rifle (e.g..M1A1, FAL, etc.) or Assault Rifle/Carbine (e.g..M-4 or variant), or any other magazine fed rifle/carbine, then I would consider the procurement of one of these rifles a priority before I purchased a scoped rifle suitable for sniping/hunting. In fact, especially in an Urban environment I would consider a battle/assault rifle or carbine, a 12 gauge shotgun and a magazine fed handgun to be a higher priority than a scoped rifle.
Not just because of the lack of longer engagement ranges, but due to the fact that the density of potential threats are much greater in an urban environment.
In my mind there are three advantages to owning a scoped rifle in a decent caliber, minimum of which would be .308 Winchester. These advantages are:
1. If you were decently proficient with the scope rifle (sniper rifle) you could expect to engage threats in the 600 to 800 meter range. But the question of how will you know they are a threat at this distance?
2. The scope, would give you an observation tool on your firearms as opposing to slinging your firearms and going to your binoculars.
3. A scope rifle is a definite advantage if you hunt game bigger than rabbits.
I have a Remington Light Tactical Rifle (LTR) with a 20 inch barrel and a Luepold 4.5x14mm scope, which lets me, on a calm day, rountinely ping the small LaRue steel targets at 600 meters. That's, of course, at the range. At home, from any window or potential fighting position in my suburban home, the farthest distance I can observe or the longest range I could engage at would be about 125 meters. Making that too easy of a shot with a M-4, scope or not.
When engaging at, say 500 meters and farther, there is a distinct advantage with a heavier caliber. If your Safe Location (Bug Out location) is a farmhouse or cabin with a 500 meter or more cleared field of fire, then it would seem a rifle calibered (as opposed to carbine caliber) scoped rifle would be a good tool to have on hand.
If you not accustomed to scoped rifles, either as a school trained military or law enforcement sniper, or have a butt load of hunting experience, then there is alot to learn about using scopes and engaging at long ranges, such as estimating range, reading winds, making scope adjustments, computing ballistics, hold off and hold over are examples. It's not as simple as placing the cross hairs on a target and pressing the trigger.
I am looking into a .338 Lapua calibered platform, but continually go back and forth between needs and wants. Everyone reading this know what that means. It would be a tool that would be very useful at my primary Bug Out location (Safe Location), but just an extra piece of equipment at my suburban home. Maybe just an expense that would be better spent on more food.