Although traditional distress calling will sometimes bring in javelina, you'll be far better served by changing your calling technique, when targeting javelina. Rather than attempting to sound distressful, think of the rolling, growling and squalling of two medium sized dogs fighting for life....thats the sound you want to play. Bill was right on about the varying responses, most times a portion of the herd will turn to engage in the scuffle, and spin and snap around you, giving you ample opprutinity to get a good shot.Other times Ive seen the whole herd scramble. Your best bet is a good closed reed wooden jackrabbit call, these Ive found, make the best growls, others are just to high pitched.My best luck calling javelina has always been to stalk as close as possible, If you get a shot without calling,great, but if for some reason they scatter, this is when calling works best. Ive called many javelina randomly, but many more after busting up the heard.