Aloha Scott,
I'm currently hunting them at night while the moon is full. I'll second what rockz says about lining up the pig before taking the shot and using your night vision. I like to get as close as possible about 10 to 15 yards before taking the shot.
Last week my friend Richard went into the pasture to see if he could locate the pigs and found them in a small draw. Because of the lighting, he couldn't make them out clearly and didn't want to risk a shot. They were also mixed in with cattle so shooting was out the the question. He decided to light them up with a large dive light. The smaller pigs and sows made a dash BUT, the big male dominate boars stood their ground and started blowing. Had they been in the open and I there to light them up, he would have taken the shot.
Moon is starting to set so we'll proberbly change tactics and do early mornings and late evenings just before dark.
Good luck Scott and I am enjoying the Great Plains bow that I bought from you. Need little mo practice before I can take it hunting.
Mark