Now for something completely different-458 SOCOM

[Critch]

My nephew likes weird rounds, really weird, and he is thinking about the 458 SOCOM, for some reason. Does anyone have any experience with this round, it looks like reloading would be fairly easy, but that shoulder is small.

I haven't found any data on it...

[Ridge Runner]

lots of data out there if ya know where to look. The niche the 458 socom fills is it gives you 45/70 ballistics in an AR-15. Mine runs a 300 gr hornady sp right at 2200 fps from a 20" barrel I use it for bear/close range deer hunting.
It was developed by marty weeme (s) of teppo juetsue (s again) old indian word for "art of rifle". It parent case was a 50 AE mag, stretched from 1.3 to 1.7" necked to 45 and the rim turned down to standard /06 size. designed as a CQB round to be fired subsonic, turns out to be a real nice 150 yd sledgehammer when loaded to full power.
Its a joy to load for now that fully formed cases are available, back when you had to make the cases it was pretty frustrating for me, so much so that the first few years I used cor-bon factory loads to get brass.
RR