Some pictures;

Trimming brass.  This gun chambers much better if I take about .010 off the end.



Reloading on the Dillon 650



A comparison of how massive these slugs are!  .22 LR on the right, 55grain .223 next, then a 500 grain bullet in a SOCOM case.



A recovered bullet after an encounter with a steel plate!  .22LR for reference.



Bob

I'm pretty sure you win for most expensive brass trimmer.

I had purchased a Dillon trim die from CH4D.  I found however that the swing on the Dillon trimmer is not large enough to face the end of the brass.



The lathe makes a easy job of it and they are all exactly the same.

Bob

.......

I use this.  Cost under $5.00

Lee case trimmer for .458 SOCOM

How fast do those big bullets go?

These are 500 grain Hornady Interlocks and are subsonic; about 1050 FPS.  Lighter bullets go faster.  325 grain, about 1600 FPS.  They can be loaded hotter but these speeds are easy on the brass and deliver plenty of performance for me.

Bob

You can push the 250 gr. Barnes XFN up to a little over 2000 fps and the 250 gr. Hornady bullet to almost 2000 fps.  My load with the XFN may be a bit on the hot side so we will find out later this summer when pressure tested data comes available after the SOCOM goes SAAMI.  
I have thrown the 500s out of mine at 1335 fps and the loads are not showing any signs of pressure.  In my bolt action pistol .458 SOCOM I can throw the 525 gr. LBT LFNGC bullets at 1467 fps but those pressures are well over the AR's limit.  I'd say the AR's limit is around 1350-1375 fps for 500 gr. Hornady Interlocks.
The 300 gr. Barnes TTSX trips out at a bit less than 1700 fps in my rifles but 300 gr. JHP can get about 1800-1850 fps.  
The .458 SOCOM is a fantastic round and if anyone is interested, check out .458 SOCOM forums for complete history and more information.  It has been around a long time, every bit as long as the .50 Beowulf and IIRC just a bit longer.  Unlike the .50B and the .450 BM the SOCOM uses rifle sized bullets and headspaces on the shoulder, not the mouth.  If the OP were to do what he is doing with the .50B or the .450 BM his cases would be ruined.  A short case in the SOCOM is just that, a short case and fully functional.  When I first started loading the SOCOM I adjusted my trimmer wrong and trimmed a few about .005 short, so rather than throw them away, I trimmed the whole lot .005 shorter.  I am still using them and that has been 8 or 9 loadings ago IIRC without checking my notes.  The cases are expensive but they last forever, and the price is going to come down once SAAMI approved and more makers get on board and pressure tested data comes available.
With maximum working pressure at 35000 PSI, even hot loaded cases are easy on the brass so no worries about wearing out the brass even if you load to the max.

Thanks Big Bore.  Good information.  I am still a young student of the 458.  It has been a rewarding venture!

Bob

I'm waiting for the SAAMI specs. I don't reload. I want one soo bad. that massive chuck of copper is AWESOME!