On Fri, 01 Mar 2013 14:00:53 -0800, Gunner
wrote:

On Fri, 01 Mar 2013 09:32:14 -0500, Ed Huntress
wrote:

On Fri, 01 Mar 2013 06:28:56 -0800, Gunner
wrote:

Ive got a couple firearms Id like to try a bigger cast bullet in
(Microgroove among others)

My molds will cast a larger bullet..say .461...but I need to size to
..459

I have, lets say ,a lubricator/ sizer die that will do .457

Any good way to open them up .002?

One assumes that they are harder than hell, and I dont have a good way
to id grind them and keep out taper.

Any suggestions or ?

Before the jig grinder was invented, that kind of work (opening up
hardened drill jigs, mostly) was done in a lathe with a high-speed
internal grinder.

A Dremel in your tool post works.

Ive got a couple tool post grinders...just really concerned about
keeping it from grinding a taper. It needs to be in the 10ths for
square.

Over the length of a die, the straightness should be in the
millionths. With a tool post grinder, you should be relying on the
straightness of the lathe bed, and only over a very short length.
Don't, for God's sake, use the compound.

And spark-out. It will only take a minute.

I've done similar things, Gunner, on my old South Bend. No taper.

--
Ed Huntress


Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie