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Thread: Subsonic 300BLK loads

  1. #1
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    Subsonic 300BLK loads

    What's the quietest 300 BLK load you've tried? I've got one with trail boss powder and 125 grain hornady Vmax that's quiet . in a bolt gun it's as quiet a .22 LR through a silencer.


    It's about a 1045 fps
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  2. #2
    CCGF Depository Dale Gribble's Avatar
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    The only subs I've made are 203 grn projectiles with 10.2 grns of 1680. Since I'm shooting out of an ar I aim for 100% function over super quiet however.
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    A1680 and H110 / W296 are my go to powders for ar sub and super sonic loads . There are some quiet loads using pistol powder for bolt action rifles. But they come with their on unique set of problems.
    Luck is the phenomena created when Preparation meets Opportunity .

  4. #4
    Senior Jas8340's Avatar
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    I'm running IMR-4227 for my subs and so far so good in my AR platform. I've got a container of Trail Boss that I want to try using my Handi rifle.

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    6.2 grains of trail boss will fill the case up to the middle of the neck , but it's very quiet in a bolt gun . I use the 125 grain hornady vmax but think most 125 grain bullets would work.
    Luck is the phenomena created when Preparation meets Opportunity .

  6. #6
    Senior Jas8340's Avatar
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    Quote Originally Posted by FLT View Post
    6.2 grains of trail boss will fill the case up to the middle of the neck , but it's very quiet in a bolt gun . I use the 125 grain hornady vmax but think most 125 grain bullets would work.
    Thanks FLT, I'll try that out!

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