We use the hog pipe at our ranch in Benavides and have good success getting the hogs to come in, problem is they can empty the corn in one night, we are upgrading by putting a trail cam near the hog pipe and gonna put a hog light to hunt the pigs after dark if needed.  We alos like to put cut apples in with the corn to keep the scent longer in the pipe and we put gravel rocks in also so when the pipe is empty with corn the pigs can still roll it around and the rocks make noise to attract other pigs.

yea i do the same thing amigo!!!!i made another hog tube and with less holes the rocks do help alot doe heck last time i put the corn bag in and that helped keep the corn in alot more time...