Be sure to do some research on where the vitals are on a pig, as they are situated differently than on a deer. The lungs are smaller and do not extend back as far as they do on a deer, etc. Do a google search and you'll find some graphics and even photos of shot pigs.
Some folks favor an ear-brain or neck-spine shot for pigs. Whichever you choose, remember that the vital area is small and demands a well-placed shot.
Ditto on pigs being chancy in terms of eatability once they get over 200 lbs. It depends on what they have been eating and other factors besides just weight, however. The best pig I have shot and eaten so far was a boar over 200 lbs. The meat is full-flavored but not rank, and it even has a tang of ginger to it!
Some people who shoot larger pigs smoke the whole thing or make sausage out of it, which adds enough flavor to counter whatever gaminess it may originally have.
Good luck with your pig hunt! I'll be heading out with my GPR next weekend for a similar pursuit, and will report back if I am successful.