![]() When I tried these same loads in my NEW custom upper, they produced significant pressure signs. ![]() Please note that the velocities and powder charges posted in the spreadsheet from ME were developed in an upper I no longer own. An expanding bullet designed for 458 Win Mag will NOT likely expand at Socom velocities. When choosing between 45/70 and 458 Win Mag, be sure to remember that the Socom produces velocity closer to 45/70 than the Magnum. Powders that work in these cartridges are usually good choices for 458 SOCOM.ĪNY. In my experience, anything slower than about 4895 (with extreme compression) is too slow for 458 SOCOM.Ĥ58 Socom is more like a short 45-70, or a long Magnum pistol cartridge. The bench was covered, the 3rd round wouldn't chamber because of unburnt powder. VERY LOW velocity, and it left significant unburnt powder EVERYWHERE. H1000 is WAAAYYYY too slow of a powder for 458 SOCOM. Will have to work up the load, but I have had good success with this load in 7mmSTW.ħmmSTW is a VERY different cartridge with a significantly different expansion factor than 458 SOCOM. I was thinking of testing some loads with Hodgdon H1000. And after a box of ammo getting it in the center - I had a lot of questions about his bore sighting. Needless to say, I got a lot of questions about my 'big' gun. I guess with other shots people had placed into this post, mine was the last straw when it splintered in half throwing pieces of 2x4 about 10 feet in the air. The first shot hung far right - straight into the target post. I had him bore sight the gun for me and afterwards I went out to shoot. Have not gotten her at 100yrd yet, but at 50 - she was tacking nickle sized groups of 5 with CorBon boxed ammo. Oh, and to Marty Teppo and the guys at Kastle, the upper shoots great. Will have to work up the load, but I have had good success with this load in 7mmSTW. As far as reloading powder goes, I was thinking of testing some loads with Hodgdon H1000. I have used a John Masen 9rnd (I got 3 in her), and some old USGI's I grabbed out of the bin at the local gun shop (20 -held 8-, 30-held 13-, and 40-held 16-). To throw in my two cents worth, I have had no problems with any of my clips.
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