I think I need to adjust my rear sight (up/down) on my Mossberg 835.Right now, im not worried about patterning it, just sighting it in. Whats the best way todo this? I was thinkingof taking a big piece of cardboard with a dot in the middle and shooting at it ataround 15 yards or so, that way the pattern willbe small enough where I can tell where it needs to be adjusted. Whats your thoughts? And can I just use regulartarget loads for this? Thanks for the help.