For anyone who builds dry stone walls there may be a better, more applicable version of the old adage of 'putting the cart before the horse'. If a waller adds the hearting up inside the wall higher than the outside course of stones it will be in the way of the next course of stones. So, one must remember not to put the hearting before the course.
But on the other hand, one shouldn't add a another stone course on before the lower course of stones has been properly hearted.
And of course if your building in a random rubble style you can't afford to be any less heartless.
Just putting out some handy thoughts.
