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Thread: Hornady 125gr SST and the .300 BLK

  1. #1
    Boolit Master
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    Hornady 125gr SST and the .300 BLK

    Just finished up doing some testing with this bullet in the .300 BLK, I thought other may be interested in the results. Details are below.

    - Rifle: Ruger American Rifle Ranch .300 BLK 1:7 twist
    - Bullet: Hornady 125gr SST
    - Brass: unfired Remington factory .300 BLK
    - Primer: Remington Small Rifle
    - Powder: H110 & Lil' Gun
    - Distance: 50yds
    - Temp: 40F

    I started with a 5 shot group of Hornady American Gunner 125gr HP to foul the barrel and have something to compare to. I then followed with 5 shots each: 17gr H110, 17.5gr H110, 18gr H110, 20gr Lil' Gun, and 21gr Lil' Gun. Depending on the data you look at, the LG loads were over max, but they are right at max according to Hodgdon. The pics really tell the story, the Lil' Gun performed the best and according to the data should definitely be fastest. The yellow dots are 1" diameter.







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  2. #2
    Boolit Master

    TCLouis's Avatar
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    Any idea what the velocity might be?
    Nothing is impossible for the person that does not have to do it.

  3. #3
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    Nothing wrong with any of those groups!

  4. #4
    Boolit Master
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    Quote Originally Posted by TCLouis View Post
    Any idea what the velocity might be?
    The 18gr of H110 should be running close to 2200fps and the 21gr of Lil' Gun should be clocking in at ~2400fps according to Hodgdon. Just as a note, the 21gr of Lil' Gun is a compressed charge and I did notice​ flattening on a couple of the primers. I will probably stick to 20gr as a go-to load with this bullet.

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    Last edited by three50seven; 03-18-2017 at 08:30 AM.

  5. #5
    Boolit Master
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    Quote Originally Posted by 54bore View Post
    Nothing wrong with any of those groups!
    Really you're right, without the fliers on the first two groups (which could have been me) they're all pretty darn good.

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  6. #6
    how hot was the barrel after shooting the lil gun?

  7. #7
    Boolit Master
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    Quote Originally Posted by BigMagShooter View Post
    how hot was the barrel after shooting the lil gun?
    I didn't check. It was only 10 rounds, and they were fired slowly, so I doubt it heated up too bad.

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  8. #8
    Boolit Master Texas by God's Avatar
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    Looking good.

  9. #9
    Boolit Master
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    This is one of my favorite cartridges I have a heavy barrel Remington Tactical rifle

  10. #10
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    nagantguy's Avatar
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    My test was very similar to yours only different bullets 125 grain speed hps and 125 grain Barnes with h110 and 296 and lillgun I was very happy with the groups out to 100! I didn't chrono them but I will next time, I've having a blast with this cartridge! And good shooting three50seven!
    Last edited by nagantguy; 03-24-2017 at 05:20 PM.

  11. #11
    Boolit Master
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    Quote Originally Posted by nagantguy View Post
    My test was very svery molar to yours only different bullets 125 grain speed hps and 125 grain Barnes with h110 and 296 and lillgun I was very happy with the groups out to 100! I didn't chrono them but I will next time, I've having a blast with this cartridge! And good shooting three50seven!
    I'm anxious to try these at 100 as well. The 300 Blk is a fun little cartridge for sure, I thoroughly enjoy loading and shooting it!

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  12. #12
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    Larry Gibson's Avatar
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    three50seven

    If you don't mind could you tell me the length of the 125 SST? Thanks

    Larry Gibson

  13. #13
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    Quote Originally Posted by Larry Gibson View Post
    three50seven

    If you don't mind could you tell me the length of the 125 SST? Thanks

    Larry Gibson
    I'm not home where I can measure them right now, but I can tell you that I seated them at the cannelure and OAL was 2.10"

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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