Thank you very much everyone The comments are greatly appreciated.
Lee......The points are duplex nails I don't know how others do them, but this is what I do. I hold and roll the nail in my fingers while grinding the end head off (dipping in water often to keep it cooled down) Keep doing this till the end cap is ground to a point. I don't cut the end off and then grind because I want to keep as much of the weight as I can When I get them ground, they tend to weigh about 146gn each.(16 penny nail) You can adjust the weight by grinding or cutting a bit off. Hope this helps.