In a perfect world, with an abundance of available ammunition, it is the shooters choice, or prefrence. While in the military, and civilian sectors, I have had plentiful resources in obtaining just about any cailber ammo known to mankind. Recent changes in our administration, ammo availability, and supply/demand has changed a snipers/shooters perspective on types of platforms and calibers where ammo is abundant to some degree. In a possible dark glume scenero, where our great nation could find itself in another civil or internal war, one is left to ponder what sniper rifle/ammo would still be available. The list of popular sniper rifle calibers up this point in time is vast to include, 308, 338, 300, and 50. Not to mention the exotic calibers as well. In a scenero where no ammunition is available to purchase, and higher powers are confiscating private ammo nation wide, what would be the prefered rifle/caliber for long range defense (500 yards +). I myself believe the 308 would be the most plentiful, and easiest to obtain. Mainly because of the it's useage, longivity, and availability in the private sector through out our great nation. Granted with in the past 20 years most distance records have been broken, but in the above mentioned scenero, the calibers that broke those records will be gone, or not available. Your bolt action 308, with average glass will become the most sought platform. It's been around a long time, proven, and millons are in homes around the USA. Just curious what evert one else thinks???? Capttom1, Remember, "KEEP YOUR POWDER DRY PARTNER"!!!