I agree with you about sticking with the common calibers. I have 0mm and 45 AGP handguns, a 12 g shotgun, and an AR 15 in .223. I have 2000 rounds of .223, 2K in 9mm. several hundred rounds of 45AGP (actually, I have another 1000 rounds, but I found that my XD 45 won't feed it), as around 200 rounds of 00 Buck, and 100 slugs. I'm not done, I intend to have at least 5K rounds of each caliber in defensive ammo. I'm also doing to get a Socom II in .308, which means that's 1 more caliber to stockpile. I will probably add more rifles as I go. I obviously believe that stockpiling is important. But, there may be ammo available that you can use, so having a platform for it doesn't hurt. And, the more ammo you have, puts you in a better position for bartering. Others will want to feed TEIR guns, and won't have prepared.