I had to remove several box hedges this year and most gave up without a struggle. However, one stump just would not let go. I cut it to the ground, it grew back. I excavated underneath it and chopped through the thickest roots (the rest go right through a old wall which can't be removed), it still kept growing. I tried a chainsaw, it blunted the blade. I drilled holes and filled them with salt then covered the stump with old engine grease (to try and smother it), more shoots appeared. I set fire to it and let the embers burn beneath it for a day, then covered it with a sheet of plastic, which so far seems to be the end of it....

So my point is, save yourself many hours of shouting at a stump and just use chemicals.

Bob