View Full Version : opening up a .356 size die to .358

08-03-2011, 12:19 AM
Is there anyone who could open a .356 Lyman sizing die to .358.

If not, I will just order one.

I sure wish I had known .356 is not the die to use for most 9mm cast bullets !!!!

63 Shiloh
08-03-2011, 01:40 AM
I believe if you PM Buckshot of LatheSmith, you will get the job done.


08-03-2011, 06:30 AM
I feel your pain. I have .356, .357 and .358 sizer dies from Lee.

08-03-2011, 08:42 AM
He said he does not open up dies so I am still looking for a solution other
than buying a new die.... but its not looking "Peachy"

08-03-2011, 08:46 AM
do it yourself. Use a cleaning rod and some 600grit emery paper. Attach one end to the rod with masking tape and wrap around the rod to get the proper diameter. Then use a power drill to polish it out to size. Will take a fair bit of time. Polish for a minute or 2, then check diameter. Usually takes me half an hour to an hour to take .002 out.

08-03-2011, 09:02 AM
Start with 400 grit for the first .001 then 600 grit for the last .001. I saw a split in
the dowel and tuck the end of the sandpaper through it. Lube with a bit of kerosene
seems to make the paper last longer. Not hard but you must push a boolit through
regularly to see where you are. I use wet or dry (black) silicon carbide sandpaper.


08-03-2011, 09:03 AM
Redneck Dan: what have I got to lose? I got all that stuff and
will get on it. Thanks for the tip

Mtgun44: roger that, another great tip and thanks so much.

08-03-2011, 10:27 AM
MtGun44's method is the one I've used, but with the addition of 1200-grit as a third, polishing step . So slow, clean and check progress often, and you'll get there.

Iron Mike Golf
08-03-2011, 10:39 AM
I have a SAECO and had the same challenge. Needed a .431 opened up. I did it by hand (no drill). Wrapped silicon carbide sandpaper around a pin gauge. I ended up using emery cloth, then the sandpaper. If you use a drill, you probably can just go with sandpaper. My sequence honing by hand only was medium emery, fine emery, 220 sandpaper, 400, 1000, then polish with Flitz.

08-03-2011, 02:42 PM
No doubt that doing a 1200 grit final polish is a plus, slicks it up real nice.

Remember to remark the die, too. Electric vibrator pencil works OK on most.