I have killed at least a half dozen wild hogs with buckshot and seen at least that many that others killed with buckshot as well. Believe me, a head shot inside 35 yards is extremely lethal. I have seen hogs in the 300 pound range downed with 00 buck at this range. It may take a second shot to finish a large hog, but he should be completely incapacitated after the first round. However, I would never try a shoulder shot, head only. I have used 00 buck out of a full choke with great success, but haven't tried a turkey choke. Since some are saying not to shoot buck through a turkey choke, you may consider just using a regular old full choke. That way you could surely shoot both buckshot or turkey loads with no problem. You may loose a few yards of maximum distance on your turkey shot, but I bet you won't notice much difference. I would hate to have to switch chokes out in the field as a hog was approaching, and vice versa with a turkey - just not a good idea. Otherwise as had been said a 44 mag or 45 long colt will also work, but again, a head shot is a lot more of a sure thing and with open sights, your range is not going to be much more than with the buckshot.
Good Luck!