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Thread: .300 AAC Twist - Best All Around?

  1. #1
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    .300 AAC Twist - Best All Around?

    I'm seriously considering a .300 blackout for my next AR build, especially since MI may be getting suppressors soon. Anyways, not sure what twist I should go with as I plan on shooting both sub and supersonic loads through it...found plenty as to which is best for each, but not so much for what works for shooting everything.

    Will I find that I'm unable to shoot both types of ammo without accuracy issues, or is there a sweet spot that lets me run both types of ammo with good results?

    Sorry if this has been discussed before, searching didn't get me far both here and elsewhere on the interwebz.

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    If you want to ever shoot the 220 gr rounds you need a 1-8 twist to stabilize. 1-10 will stabilize up to around 200 gr and might give you marginal velocity advantage but limits your bullet selection.

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    You aren't likely to find one barrel that will shoot both heavy subsonics and light supersonics well. You'll have to choose one or the other. I'd lean toward 1/8" for heavy bullets as that is what this round (300 Whisper) was originally designed for. It's hamstrung by low case capacity for supersonic performance.

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    As far as subsonic goes, will the lighter heavy rounds be as quiet as the real heavy ones? Or is the only loss in energy delivered at the target? Completely new to subsonic stuff, my state doesn't allow cans so I'm not really up on it.

    With a 1:8 twist, will the lighter projectiles not shoot well at all, or are we talking about a slight decrease in accuracy? Keyholing would be bad...but not too worried about a little less accuracy.

    Can I 'make do' with a middle of the road twist rate?

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    Perhaps I can mitigate this issue right now...will the subsonic loads still have enough ass behind them to kill medium sized game, including two legged creatures, at 200 yards? I have a hard time believing it will however from what I've read some people say it will...

    My main goal with this rifle is to have a 8-10" barreled upper plus suppressor (if we ever get the damn things) that would be good for hunting and possible HD use. For hunting (deer mostly) I typically mandate my rifles be good to 200 yards just in case.

    Have any caliber specific projectiles been released for subsonic .300 AAC yet? From what I read that was part of the issue with performance at longer ranges...there just weren't any bullets designed to expand that slow.

    So will I even need supersonic ability for my needs? I'm trying to read all I can but this stuff keeps updating so fast, and there's SOOOO much to read on the issue.

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    TANSTAAFL. There's No Such Thing As A Free Lunch.

    However, there are compromises that just might get you the performance and flexibility you're looking for.

    First, I think it's silly to build a rifle optimized for suppressor use when your state might someday let you have one. Just my opinion and if it stinks, please feel free to ignore it.

    Second, the slower twist will shoot heavier bullets if those bullets are kept short. It's possible the standard twist will shoot bullets as heavy 180 -220 grains if a round nose is used. The 30-40 Krag will shoot a 220 grain round nosed bullet fine with it's 1:10 twist. Hornady lists loads as slow as 1600 fps. That's a bit more than than subsonic, but it's worth exploring as a long spire point doesn't offer much advantage at subsonic speeds and close ranges. The 30 caliber round nose also offers better performance and deeper penetration on game at slower speeds.

    Do you need subsonic loads to hunt deer and defend hearth & home? No
    Last edited by MistWolf; 03-21-11 at 04:27.
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    1:8 is the best all around twist, as that is what we picked as the standard twist.

    With shorter barrels and supersonic bullets and 1:8 twist, the lighter the bullet, the better the accuracy (110 is more accurate than 115, and 115 is more accurate than 125, and 125 is more accurate than 150).

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