Yeah Krombig, I usually use 4, 3 for the front and 1 for the back, most of all be comfortable when shooting, don' t sit in an awkard postion, bring your rifle to your comfort don' t be hunching down to low or stretched out to high. Don' t fill the bags to full, you will need some room for the rifle to settle into them, I like for my sand bags to be about 3/4 full. I usually just twist a small wire around the top of them real tight after filling them and then snip it off pretty close so it won' t be getting into your gun. Once you get the rifle settled down in the bags on a good bench the only movement you will have will be from your heartbeat, and that is really hard to see with a small scope but when you go to getting above a 12 power or so you can pick it up pretty easy. I just got out of a match yesterday, I shoot a model 700 bull barrel in a 243 caliber with a 24 power scope and at a hundred yards its hard to hold on the 1" red dot without your heartbeat moving your crosshairs off of it.