Being cheated out of claymore kills

Having an issue where your claymore will go off often but not hurt anyone or barely hurt them but rarely ever kill them? Most people don't know how to lay a proper claymore, lay your claymore so that when someone is just at the door it will go off but will not be facing them, the best placement is to make one of the red lines parallel with the wall that the door is on so that none of the blast is wasted on the wall its all on the open area where they will run by. Don't lay the claymore close to the door because they may just run into it and past it before it blows up, lay it a little back, you'll have to practice to find the perfect distance back but this works very well. If you have trouble finding that distance or you want to insure a kill then i highly suggest using the 2nd perk "Danger Close" and lay the claymore a little further back so it will cover more area.