I am looking to build an AR-15 to use hog hunting in Florida next year. I just got back from my trip this year where I used an AR-10 chambered in .308. The .308 worked very well taking 4 hogs with the longest shot being at 481 yards. The properties that we hunt are large ranches with the smallest being around 3,700 acres. We do a lot of walking as well riding from pasture to pasture looking. Depending on the ranch we have access to a side by side and an elevated swamp buggy. I like my .308 for the longer shots but want something a little lighter and faster to swing especially for close shots of fast moving pigs. I missed 1 this year when a group took off after the first shot. I cleaned missed right behind it at about 30 yards moving from my right to left. Most of the others I hunt with are using .300 BO or 6.8 SPC with a couple .270 bolt guns and even a .17 WSM thrown in. I have watched both the .300 BO and the 6.8 SPC rounds effectively drop hogs and also watched hogs run after being hit with both calibers. I know there is no perfect caliber but for those with experience with either which would you prefer and why? I will be reloading for whichever caliber I go with. If you have other calibers you recommend please let me know.