Opening us a Lyman H&I die from .431 to .4325

[Leadmelter]

I know this has come up in the past. I want a .432 sizer die for the my 44's. Is this something I could try with a Dremel or leave it to somebody better equipped? Who is that somebody?
Leadmelter
MI

[JonB_in_Glencoe]

I've honed a few sizer dies.

This pretty much covers it.
http://castboolits.gunloads.com/showthread.php?28989-Honing-out-a-sizing-die

[country gent]

Size a couple bullets and lap out up to size like you would a mould. Better if you could to turn a brass lap 2-4" long.drill and ream a taper pin hole in the end and split this allows "adjustment of the lap over time. tap the pin in a little and return to size. then coat with 600 grit compound by rolling between 2 plates and work the hole up to size. This will go pretty quick since only .0005 needs to be removed on a side.

[beagle]

Now, I'll throw something in here. I had a big sizer once..433" to be exact. Bigger is not always better. Be sure that a round loaded with a big bullet will chamber in your gun. Number 2 Be sure that your seating/crimping die will handle a bullet that big. On mine, I had to relieve the crimping shoulder or it would tend to seat the oversize bullet. Just a couple of thoughts from my stumbling around./beagle

[S.R.Custom]

You can buy them 432 already.

Polishing out a smaller die leaves a sloppy fitting post and lube squirting out everywhere. Ask me how I know...

[DougGuy]

I use a Sunnen hone for cylinders, it will do dies quite nicely but again the punch isn't any bigger and now you got lube going everywhere except where you want it. I would suggest buying the right die and punch. Is Lathesmith still making dies?

[Mal Paso]

If you used a split dowel and 600g paper you could lap the top of the die. That small amount would be easy.