Originally Posted by royinidaho
This is one heck of a conversation. I have no idea of what you are talking about regarding types of steel etc. but. . .
How in the heck is a pointing die made? What kind of a tool or process is used to get the ogive and point. I'd really like to understand more about that.
I have not actually made a point forming die yet , made core seater's and swagers as they are the easy ones.
However I can give you a rough idea .
Turn the ogive and diameter you want onto a shaft of tool steel a certain amount under finished bullet diameter . Using a ball turner . Then mill it to a half reamer and heat treat . You would make two or three just in case . Then using the same settings turn up some brass lapps.
starting under size and working up to the bullet diameter
Then you have to turn up the blank . I would just turn it straight and square to start with as you don't want to waste threading the outside in case you screw up the cavity .
Step drill the basic cavity , then ream it to shape and under size . Then lapp the cavity out until it is approaching finished bullet size but still with meat left to lapp out after heat treating .
Then finish turning and threading the outside .
After heat treating continue lapping.
The hard part is getting the smooth finish to come up just as the correct finish diameter is produced. The advantage of the home hobbyist is that you have way more time to get it right than the pro's . So you can lapp a lot longer on the fine grit to preserve the finish waiting for the right diameter.
If you only have one lathe you may have to remove the die from the chuck and lapp in a fixture as you may need the lathe to make extra brass lapps.
I have a lot to learn myself but that's a rough guide.