Im an active shooter looking to break into the long distance world. I'm looking at getting an accuracy international aw series but I don't know if I want it in .308 or .300 win mag a grand is about as far as I'm wanting to go, but I'm in a line of work to were this rifle (when I get good enough on it) may see more than paper targets so I need ballistic integrity at that range. I've got a lot sniper buddies telling me that .308 loses it's punch at 1000yds, but I'm worried about ammo availability of the 300 win mag in foreign countries. I'm just looking to weigh some options so any insight will be appreciated.