big old smart hogs usually don't stroll about during daylight waiting to be shot. If it is legal, it is in Texas, I would spotlight the hogs. They are far more active at night. Otherwise hunt early and late. The .38 is light for pigs. It is better than nothing though. The .300 will work great. Shoot them in the neck. Check out
http://www.texasboars.com and read all you can.