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Thread: 458 socom 350gr alliant unique

  1. #1

    458 socom 350gr alliant unique

    Hey guys this is my first post on here. I've reloaded 5.56, 45, and 12 gauge. However 458 socom is a new beast. I would like to use my alliant unique powder with some rainier 350gr bullets rated at 1500fps. The 458 has a max pressure rating of 35k and unique has a tendency of high pressures (from what I've read, I've only gone by reloading book data for 12 gauge and 45, never experimented). Anyone have some recommendations on starting weight for the powder? And a possible oal if you've used this bullet. Black Butterfly (458 socom ammo distributer) uses this bullet for their plinking ammo. All the help I can get would be great considering the lack of info there is for this particular set up.

    https://www.midwayusa.com/product/10...ated-flat-nose

  2. #2
    Boolit Master



    M-Tecs's Avatar
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    Not sure how many here load for the 458 Socom. More here http://458socomforums.com/

  3. #3
    Boolit Master dkf's Avatar
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    Unique is a fast powder, not ideal for the .458. It will never be able to cycle an AR but that is not an issue if you have a bolt gun nor expect it cycle a semi. I have not come across anyone whom uses Unique in the .458 on forums and on the FB group in the 3 years I have been into it. I believe someone posted some quickload data with unique on request but the numbers were not pretty nor ideal. Also the Berrys and Rainier plated bullets are not know for their accuracy either, but that is at supersonic velocities. If you want to fool around with light loads I would use Trail Boss. But trail Boss won't cycle an AR either unless the gas port is opened up significantly.

    For the Berrys I would start with IMR 4198.

  4. #4
    Boolit Master hicard's Avatar
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    I agree with dkf on IMR 4198. That is what I use. Unique will only lead to failure, especially in an AR-15.
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  5. #5
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    I have a great load using 2400 powder and a 350 gr bullet if interested
    I carry a Nuke50 because cleaning up the mess is Silly !!

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  6. #6
    Thanks guys, ill get some imr 4198 or lil gun tomorrow and use some known charges. I can't register on 458socomforum and I need to set up an isp email to register on ar15.c0m. I have unique on hand so that's why I asked, couldn't find load data for it.

  7. #7
    Boolit Master dkf's Avatar
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    IMR 4198 is all around a solid performer. Just be aware there is H4198 which is not the same but will also work. In case you don't already know Lil Gun is a temperature sensitive powder that burns really hot. A lot of guys use it but I don't find it to be anything special and I avoid it for the reasons listed. Too many other good powders out there.

    The 458 socom forum can take a while for the registration to be approved. The site has some quirks but once you become a member it works well. There is bunch of quick load data for different bullets on the Teppo Jutsu website that you can download if you do not already have it. I find the data to be pretty darn close with the powders I use. I often use this data as a basis for an "educated guess" of starting loads for bullets that there is no data for, cast included.

  8. #8
    Quote Originally Posted by Rwilson18 View Post
    Thanks guys, ill get some imr 4198 or lil gun tomorrow and use some known charges. I can't register on 458socomforum and I need to set up an isp email to register on ar15.c0m. I have unique on hand so that's why I asked, couldn't find load data for it.
    H-m-m. I've loaded 45-70 with Unique for over 60 years, if that means anything. Important to be careful loading Unique. Make sure you never double load a case!!

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check