JMHO, but I found "Texasboars.com" as a good forum for learning from some of the more experienced Texas hog hunters. The forum rules are enforced but should be no surprise to this group.
http://www.texasboars.com/phpBB2/index.php
This "Info for New Hog Hunters" is dated (2009) but still good gouge to seasoned as well as newbies.
Info for new hog hunters.pdf
Shot placement...
shot placement.jpg
Good hunting!