================================== I tried it (lead loading) because I saw it being done on expensive Jaguar renovations near Bridgnorth. They used ordinary grinding disks on an angle grinder which looked pretty clogged up to me. Maybe I only saw the start of the process but there was no obvious use of other tools in evidence.
If I ever feel the urge to try lead loading again I'll remember to try a rasp which I've used on roofing lead to shape around pipes etc.
Cic.