first of all, you have to consider the tolerance, take a look at the maximum and minimum lead diameter for the component: in the case of minimum lead diameter to maximum hole diameter, the difference should not exceed 28 mils in the case of minimum hole size to maximum lead size, the difference should not be less than 6 mils this is for auto insertion and predates no lead but obviously you want to shoot for the middle rather than toward either extreme design for auto insertion and manual insertion will be fine