Re: Forster sizer damaging cases
Follow Fitch's suggestion, easy to do and works fine. I've never had to remove burrs from new dies but I've used this method of deburring used dies many times.
All you need is a snug fitted rolled polishing wad, not tight, wound around a saw split dowel, 1/4" to 1/2" as needed, and a minute or so of spinning with the drill. It will help if you have a reversable drill so you can "wipe" the burr from both directions. And 400 (or finer) grit will be perfect. Don't worry about changing the dimensions of the die, it's case hardened steel and will take a LOT of such spinning with a fine grit materal before any measurable amount of metal can be removed.
You can re-polish the inner surface to mirror-like with strips of cloth wound around the same dowel and applying white or green rouge metal polish to it. But don't. Contrary to common thought, the light matt surface remaining from the 400 grit paper will make resizing effort less than a mirror surface A matt surface holds case lube much better than a high polish surface.
Last edited by boomtube; 05-17-2010 at 10:39 AM..