Maybe I am being too ambitious!
I center a set of BRASS mould blocks in a 4 jaw chuck on my lathe.
Then I start by using a 1/4 inch drill to drill ALL the way through the blocks. Of course, where the drill comes out of the blocks will be the top of the mould and will be where the sprue plate will be installed when the mould is finished.
Then using larger drills, up to a 1/2 inch drill, I remove most of the brass from the future mould cavity.
Then I stick in my "reamer blade" which has the outline of the ogive of the bullet and also the grease grooves. Turning at 600 RPM I move the tool post, allowing the "reamer blade" to enlarge the cavity.
I use a dial gague to keep track of how much I have moved my tool post and stop when I figure that my mould cavity has been enlarged by the reamer blade to .575 which is the size of the cavity I want.
Unfortunately, this method is slow. Failing getting a CNC lathe-is there a better way to make a lathe bored bullet mould cavity?
Any Advice Will Be Greatly Appreciated!