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  1. #1
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    Jan 2011
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    Question Bullet weight for 300BLK in 1:7 twist

    For the 300BLK folks - I have a 16", 1:7 twist 300BLK barrel on the way.

    In supersonic commercial rounds is the 110 gr bullet it's likely sweet spot for accuracy or perhaps something lighter/heavier?

    Thanks
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  2. #2
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    Hornady black 110gn V-max is amazeballs accurate in mine. I have also had really really good results from PPU 125gn BTHP's. On the other end I have also had great results with the sub 208s too. My barrel is a Rainier Arms Ultra match SS barrel with a 1:7 twist.
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  3. #3
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    Quote Originally Posted by Dorkface View Post
    Hornady black 110gn V-max is amazeballs accurate in mine. I have also had really really good results from PPU 125gn BTHP's. On the other end I have also had great results with the sub 208s too. My barrel is a Rainier Arms Ultra match SS barrel with a 1:7 twist.
    Barrel length?

  4. #4
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    Jan 2011
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    Cool. I'll get a variety pack of 110's to start with.

    I found plenty of data for the 1:8 twist, however hardly anything for the 1:7
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  5. #5
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    Quote Originally Posted by khadga View Post
    Barrel length?
    oops lol. It's a 16" on my RECCE.
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  6. #6
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    Quote Originally Posted by Puddle View Post

    I found plenty of data for the 1:8 twist, however hardly anything for the 1:7
    It doesn't make any difference, your results on target are not dependent on the twist rate, and load data is the same regardless. You have to understand - that fast twist is there to handle heavy bullets for subsonic loads. There is no "optimum" supersonic bullet weight for those fast twist barrels, because the optimum weight/length is about double what you use in a supersonic load.

    What does influence your accuracy more are the characteristics of your barrel's bore and throat. Those are things that vary between different manufacturers, and to some degree even between different individual barrels. Twist rate is way down the list of things that will affect your accuracy with 300 Blk supersonic loads.

    Some suggestions to try: 110 V-Max, 110 Barnes black tip (not an accuracy bullet, but arguably the best terminal performance of any big manufacturer), 125gr Nosler Ballistic Tip, 125gr Sierra Tipped MatchKing.
    All of those perform well, but it's up to you to figure out which ones are the most accurate in your barrel.

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