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Thread: 300 AAC

  1. #1
    Terminator Products Kiwi Greg's Avatar
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    300 AAC

    Here is a shorty sub sonic 300 AAC, with its temporary stock.



    It is 780mm long, weights 2.945 kgs, 6.5 lbs as pictured with the VXR 3-9x40 scope



    Shoots the 240 SMK really well at 1010 fps, sub moa with slightly oval holes.



    Zeroed at 50m it needs 3.25 moa for 75m & 7.75 moa for 100m, 25moa for 200m , didn't try 200m, sorry pic is a bit messy....



    It will be interesting to compare its terminal performance with the 450 Bushmaster.

  2. #2
    Ex stick thrower madjon_'s Avatar
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    Nice.
    8 twist?
    Real guns start with the number 3 or bigger and make two holes, one in and one out." -

  3. #3
    Almost literate. veitnamcam's Avatar
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    Boy that is short!

    Would a 75y zero not be a bit more practical on a subsonic ?
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  4. #4
    res
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    Awesome
    Using Tapatalk

  5. #5
    Load....Action....Instant ....Watch and Shoot! ishoot10s's Avatar
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    Don't mean to be picky, but the correct designations for this chambering, as ratified by SAAMI, are "300 AAC Blackout" or "300BLK". Not "300 AAC" or any other combinations...

    Nice wee build, but if the holes are slightly oval, are the pills not quite stabilising?
    Last edited by ishoot10s; 03-01-2015 at 06:01 PM.
    10MRT shooters do it 60 times, in two directions and at two speeds.

  6. #6
    Terminator Products Kiwi Greg's Avatar
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    Quote Originally Posted by veitnamcam View Post
    Boy that is short!

    Would a 75y zero not be a bit more practical on a subsonic ?
    If it didn't have a dial scope yep.

    Easy enough to wind 3-5 moa on dial & be GTG

  7. #7
    Terminator Products Kiwi Greg's Avatar
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    Quote Originally Posted by ishoot10s View Post
    Don't mean to be picky, but the correct designations for this chambering, as ratified by SAAMI, are "300 AAC Blackout" or "300BLK". Not "300 AAC" or any other combinations...

    Nice wee build, but if the holes are slightly oval, are the pills not quite stabilising?
    Yep the approx 7" long 8 twist looks like they aren't quite stable, very accurate & staying in line all the same though.

  8. #8
    Terminator Products Kiwi Greg's Avatar
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    Quote Originally Posted by madjon_ View Post
    Nice.
    8 twist?
    Thanks Jon, yep 8 twist TF approx. 7" long

  9. #9
    Load....Action....Instant ....Watch and Shoot! ishoot10s's Avatar
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    Quote Originally Posted by Kiwi Greg View Post
    Yep the approx 7" long 8 twist looks like they aren't quite stable, very accurate & staying in line all the same though.
    That's interesting, so with that twist and length combination they're not gettng driven a full rotation before clearing the rifling. I wonder if there's an established formula that applies in respect to that. Mine is a 16" 1/8 so my 240SMKs get almost two full driven turns. You're still getting good accuracy though, can't be too much of an issue.
    10MRT shooters do it 60 times, in two directions and at two speeds.

  10. #10
    Ex stick thrower madjon_'s Avatar
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    My 300 whisper JDJ is 8 twist 16"
    Fcuk I miss my rifles,Albany shooters club had a range day today an I had to do the craft market thing in Denmark
    Real guns start with the number 3 or bigger and make two holes, one in and one out." -

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    The 240 grn smk were the worst grouping load in my rifle the best I could get would be 3 inches at 50m with the load mentioned above. Lehighs group really well just a bit expensive for hole punching paper.This is out of a 12.5" barrel.

  12. #12
    Terminator Products Kiwi Greg's Avatar
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    Quote Originally Posted by Markgibsonr25 View Post
    The 240 grn smk were the worst grouping load in my rifle the best I could get would be 3 inches at 50m with the load mentioned above. Lehighs group really well just a bit expensive for hole punching paper.This is out of a 12.5" barrel.
    What is your twist rate ?

  13. #13
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    1:8. It will near enough same hole group supersonic stuff at 100m and subsonic with the Lehigh is a inch at 50 m. I couldn't get anything decent with the 240 grn smk

  14. #14
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    out of this
    Attached Images Attached Images  
    screamO likes this.

  15. #15
    Official Cheese Shaman Spanners's Avatar
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    Subs are all about balance of the projectile rather than twist.. Or you can add twist to make up for longitudinal balance.
    You will be able to launch a crayon shaped projectile at sub speeds in almost any twist and have it stabilize, but you have to spin a heavy VLD a lot faster
    veitnamcam likes this.

 

 

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