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Typically when I retool dies like that, I'll take a carbide chip cutting tool, and do my best to eyeball a radius on the mouth and then I'll start with 200 grit, followed by 400 and then 600. 600 is about the finest you need to go with most die projects, bullet making dies can be another story.
If you need to work inside the die one trick is to make a "lead lap". Find some lead wire, and with the die in the lathe put the lead wire into the tailstock put some valve grinding compound on it, and then put some cutting oil in the die, and at slow speed force the lead wire into the die, be sure not to overgrind!
This trick works really well on steel dies that have brass buildup and are scratching cases.
If you need to work inside the die one trick is to make a "lead lap". Find some lead wire, and with the die in the lathe put the lead wire into the tailstock put some valve grinding compound on it, and then put some cutting oil in the die, and at slow speed force the lead wire into the die, be sure not to overgrind!
This trick works really well on steel dies that have brass buildup and are scratching cases.