120gr Hornady SST info - Page 35
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  1. #341
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    Quote Originally Posted by Gflysum View Post
    27 grains of AA2200 will give you 2500 fps from a 16" barrel - I see others saying the preferred load is 27.5, but the max load per the Alliant load data is 27.2 -- fwiw I'm getting right at 1 MOA from my Wilson Combat match 16" barrel


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    This is correct. I got those numbers out of my 16" ARP barrel, COL of 2.294, today using 120gr SST and A2200. My max load was 27.4gr and it was starting to flatten the primers at that point and I didn't load any higher. Best accuracy came with loads between 25.6 and the 27gr with .5" groups at 100 yds on a hot barrel.

    Ramshot TAC works well too but not as high velocities. Accuracy just as good though. I loaded 20 rounds from 25.5gr up to 28.2gr of TAC. Velocities were nearing 2350 fps MV and 1" groups at 100 yds. No flattening of primers even at 28.2gr loads.

  2. #342

    Default 120 SST short stroke

    Guys, I have a 18" ARP 6.8 barrel with the ARP superbolt. I have been shooting S&B 115 FMJ factory and Hornady 120 SST factory without any problems. Today I shot some rounds I hand loaded for the first time, through a chronograph. I loaded 120 SST, S&B brass, AA2200 powder at 25g, 26g, 27g, 28g. I shot 5 of each and every single one short stroked. The 28g loads got the same velocity as the S&B FMJ's factory loads.

    Any ideas on why my hand loads are short stroking?

    Thanks

  3. #343
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    Quote Originally Posted by wesoos View Post
    Guys, I have a 18" ARP 6.8 barrel with the ARP superbolt. I have been shooting S&B 115 FMJ factory and Hornady 120 SST factory without any problems. Today I shot some rounds I hand loaded for the first time, through a chronograph. I loaded 120 SST, S&B brass, AA2200 powder at 25g, 26g, 27g, 28g. I shot 5 of each and every single one short stroked. The 28g loads got the same velocity as the S&B FMJ's factory loads.

    Any ideas on why my hand loads are short stroking?

    Thanks
    wes: There must be something wrong with your rifle. 27.5 gr of A2200 is about max for this bullet and 28 grains is more than enough to provide the requisite amount of pressure; out of your 18" barrel, you should be getting well over 2500 fps. I suggest you double check all the usual suspects: gas rings, key, tube and block. - CW
    No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; - part of 14th Amendment to the US Constitution

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  5. #344

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    Alright guys I need a sanity check here. New to loading for the 6.8 but not new to loading. I've been working up ladders for 120 sst and H322. Rifle Stag 7H, 20.77" barrel. Hornady brass, Fed AR match primers. Started at 27g and worked up looking for pressure signs and accuracy nodes. No pressure signs (craters, flatten primers or swipes) up to 28.5 grains at which point I got scared and stopped because this seemed way hotter than most of you guys have posted. Also crazy enough this was my most accurate load at .6" five shot groups. Didn't crono but group placement continued to rise for nearly every charge level so I'm thinking velocity didn't flat line. Even had some of my reloading buddies check my brass as well to make sure I wasn't missing something. Shouldn't I be seeing pressure signs at this load level?

  6. #345
    6.8 SPC Lover
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    Hogdon lists 28.2 max with a 115 sierra. No data for the sst. I would cross check the hornady manual.

  7. #346
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    Hornady manual shows 27.1 gr of H322 as max load for the 120 SST at 2350 fps. This is the latest manual. That is for a SPC chamber I am sure.
    NRA PATRON Life Member

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  8. #347

    Default

    Yeah I have a spec II chamber so I started with max load on Hornady's manual which is spec I and worked my way up. Just couldn't believe I went that high with no pressure signs. Forgot to mention above that COAL was 2.295 to keep mag length.

  9. #348

    Default Confusing Ladder Results AA2200 120 gr SST

    I laddered up some 120 SST. The results were confusing.
    AA2200
    COL: 2.295
    cci #41
    bison 16" Recon barrel
    90 degree outdoor temp

    27.0 grains = 2370 ft/sec avg

    27.2 grains = 2350 ft/sec avg (best hand load groups)

    27.5 grains = 2358 ft/sec avg - all brass between 4 and 5 o'clock

    Hornady Factory = 2444 ft/sec avg (overall best groups) - primers showed the most pressure; brass at 3:00 o'clock

    If I could get my handloads to match the Hornady Factory, I would be good...

    Thoughts?

  10. #349
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    Quote Originally Posted by CENTEXHOGHUNTER View Post
    I laddered up some 120 SST. The results were confusing.
    AA2200
    COL: 2.295
    cci #41
    bison 16" Recon barrel
    90 degree outdoor temp

    27.0 grains = 2370 ft/sec avg

    27.2 grains = 2350 ft/sec avg (best hand load groups)

    27.5 grains = 2358 ft/sec avg - all brass between 4 and 5 o'clock

    Hornady Factory = 2444 ft/sec avg (overall best groups) - primers showed the most pressure; brass at 3:00 o'clock

    If I could get my handloads to match the Hornady Factory, I would be good...

    Thoughts?
    Welcome to the forum. Around 27 grains +- is max load with that combo. What the chrono is telling you is that you are at max because you are adding powder and the velocity is flat. Most folks have trouble surpassing Hornady factory speeds with the sst because they are using a proprietary powder not available to the public. With an ARP barrel you can get close. On vacation now and dont have my data but with the same combo at 2.260 I'm mid 2400's with arp scout.


 

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