120gr Hornady SST info - Page 35
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  1. #341
    6.8 SPC Fan
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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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    Jul 2011
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    Western WA
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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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