Don't need a fancy gizmo to bore sight your guns. If they are bolt guns, remove the bolt, put on sand bags or your favorite range rest. Look through the bore at a target at 25-50 yards, adjust scope so the line of the bore and the scope are close. Fire a shot, adjust scope, fire another........ When it's where you want it, move to a hundred and fine tune. If not a bolt gun, set up a large target at about 25 yards, fire a shot, adjust scope, repeat. Shouldn't take more than a couple shots either way before you're moving to a 100.