Ok, I'm new here, but I get the general consensus of 6.8 is the norm, .308 is awesome, and 5.56 will work, if that's all you have. But let's dig a little deeper. I collect evil black guns. The only blue and wood gun I think I own is a Winchester 101 20g for bird hunting. When I decided to go hog hunting, my big question was, what should I take? The guys that went with me, were as new to hog hunting as I was. We were going somewhere we had never been, to shoot something, we had never seen. Piece of cake. Hmmm, what should I take? Have a question? Consult YouTube. I have watched so many videos of hog hunting, that I feel like I know Todd Huey personally. BTW, the boy is getting big Todd. I have seen videos of hogs being shot with everything from .22 rim fires to .50 BMG. It didn't help. I left there with a desire to buy a .50 BMG. My big dilemma was, I can't suppress a .30 caliber rifle. I screwed up and bought a 5.56 can instead of .30 cal, years ago. That rules out buying a "proper" hog killing gun, before the trip. Here's where I embarrass myself. I filled out my 5320 form and brought 3 SBRs, 2 full size ARs, a .308 bolt gun, and only god knows how many pistols for a four day hunt. In the end, I shot pigs with two guns. The 16" Colt with the thermal, and the 10.3" Colt with a Aimpoint. The little Colt was for walking up to them after they were down. Hey, I'm from Indiana, I was a little nervous. We don't have 200 pound German Shepards running loose up here, that want to eat your ass! I brought an HK UMP in .45acp, thinking, hey, we will be in stands, it will be perfect for 50 yards. My first pig was from a stand at 50-60 yards, in daylight, but I brought the thermal that night. The following two nights, I brought the HK, but saw nothing before the sun set. It's my one regret. I wanted a hog with a .45 SBR. So what odd caliber or gun have you used.