With the limited information I could find with web searched I trimmed a 357 MAX case to 1.40 and ended up running it as far as possible into a 223 sizing die. It is just starting to roll the case mouth. It is still over 1/4” shy of chambering.  A 32 Miller case fits fine and the diameter just in front of the rim on the MAX case is the same as the Miller.  I have a couple of other sizing dies I could try but I know others have the right steps. 
BTW. The link in the cartridge conversion sticky no longer works. 

Thanks

Jack

What is a 32RKS? Not familiar with that round. Sounds interesting.



   JMH

It was a Ron Smith idea and was quite prevalent when the Calgary crowd came to Tommy Mason’s Starts and Stripes range north of Spokane every year.  Basically a longer version of the 32 Miller series. Schuetzendave will have more history. 

I am having a BRC barrel chambered for it in a small shank high wall that I picked up here but before I sent the reamer off to be professional done, I decided to use it on a short 33 Miller short barrel from Chuck Bordman’s estate that had had a checkered past. It has been set back so many times by a couple of guys and had never shot well. I had mixed results as well and will try it as a 32 RKS and eventually maybe a 32-40. 

Jack

The 4 cases I made for the barrel that I reamed out from 32 Miller short to 32 RKS fit fine until fired. I eventually had to knock them out with a cleaning rod. I ran them all the way up into a 357 Mag sizing die without a shell holder and will try that next. I will look for a small base 223 die.

Jack after running them through the .223 die the cases you have already previously trimmed will squeeze out longer requiring you to retrim them again to 1.470".

Some .223 dies do not squeeze the web of the .357 Max cases enough - for me the Lee dies needed to be pounded out after the first firing.

Ron Smith adivised me to use RCBS .223 FL dies instead and make sure you bottomed the dies out to the shell holder when FL sizing to properly squeeze the web enough.

Yup worked very well.

We also made ourselves tools to finely bell the mouths for a tighter seal of the .32 RKS cases ( I used the Lee .223 FL die to make my tool since it would not FL size the .32 RKS cases).

I have a number of the Lee hand loading presses.

I have a separate one for the belling tool so I do not have to readjust the depth settings.

I also keep two using a universal decapping die.
Keep one in my shooting box for use at Schuetzen or BPCR matches  and another one at home on the reloading bench.

They are very handy.

Good idea Jack.

I am picking up a free 222 die today and will see how it works.   
Thanks all

Jack

I just got out a new 357 Max case and using the cut down die only, was able to full length size a case ending up with a .373 base from .375.

If you use heavier powder loads you could get carbon streaks on the outside walls and even dimpling of the cases.
With the belled case mouths you stop the dimpling or gas getting around the case mouth causing carboning around the outside wall of the cases.
You do not need to do it every time.
I rebelled the cases after about five firings.
Belling is not required if you keep your loads down to 1,100 fps to 1,400 fps.
For us shooting in the 1,500 fps to 1,600 fps range then belling is highly recommended.