25-20SS

There have been more than a few posts on this subject, in fact a sticky exists here so I may be flogging a dead horse.  I’d prefer not to piggy-back on an existing post so I’ll put this one out there and let it fade naturally.   Most of what I’m doing has been discussed and Brian put together a video that shows the process, this part of mine varies only slightly, I won’t bore anyone with that.  Brian mentioned that he was going to make the mandrel for inside the case for ease of turning, never heard anything back but I hope he figured it out.  The last swaging step I do requires a slightly smaller mandrel in order to turn it, but that’s not much extra to do.   
I have a couple of procedures and sequences gleaned in this recent round of brass making that improves cartridge quality a smidge.   As per my mode of operation I'll get to these methods in one of the next paragraghs along with some mundane pics -   
As an experiment, I took my Harrell’s measure with me to the range, 10 newly made pieces of brass, a box of primers (which I left on the reloading bench and once I got everything set up at the range, realized and had to gather my gear and make a dash back and grab those – never happens to anyone else I’m sure) and a box of fresh cast and lubed pills.  My intent was to develop a load but also to run this brass through the paces and see how it lasts.  Each piece was loaded and fired 10 times with no issues.  A load was settled on and performance consistency from case to case was better than expected.   For parameters, I didn’t clean the rifle until shot number 70 as the LabRadar was indicating something was amiss.  There may have been some carbon fouling, but 3” in front of the chamber leading occurred.  Once removed, accuracy and velocity consistency returned. 
As promised here's a couple of mundane pics of the final 30 or so shots at 200.  A light 8-10 mph breeze played with my horizontal.

The next thing I did different was to make a second die, fairly simple in design - the bore was reamed and polished straight at .317” diameter.  The mouth of the die was then machined with a 30° bevel about a ¼” long to push the swaged donut down closer to the rim.  This feature when used does force more brass into the head and web area, reducing case capacity even more and it does reduce the flash hole size so another step is needed: reaming the flash hole.   I have discovered that when forming this brass, the primer pocket needs uniformed several times in the process, to stay ahead of it - before each swaging process and one last time before loading the case and it goes smoother.  The remaining donut left after the case is pushed in this last die is very small, less than .050” diameter of material to machine off and not much more than .070” long.

The next case process I did a post on here a year and a half ago.  It's the 28-30SS case made from the 30-06.  There's been a few changes and I have a little clearer process worked out.   I'm currently squeezing in a rifle build in this caliber with plans of having it shooting in the next day or so - more results to follow.

Vall,
I use a 4 ton arbor press.  The hydraulic press tests my patience even though it's fairly quick.  The arbor press is so much faster and it gives me a little workout as a benefit. 
GT