Cavity Back Bullets Thread - Page 13
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  1. #121
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    Default report on 30 cal load data

    just an FYI for those looking at loading the 30 caliber 168grain CBB

    Someone else is trying to work up a load for the 168CBB in a 308w and ---- he tried to use book data for same weight lead core bullets and came in over pressure --- he then tried load data for a 168 barnes bullets and seems he is now in the right charge weight range

    the 6.8 CBB have been using book data for like lead core bullets and been OK, not sure this will be the case for all of the CBB

    Just remember guys, start low and work up---look for any pressure signs-- use a chrony to see if you are in the correct vicinity of speeds, and be careful and good luck
    Last edited by Texas Hog Man; 03-21-2017 at 07:00 AM.

    LUCK
    is the residue leftover when you subtract chance from preparation.



    Mil-Spec means that it meets the lowest specifications that the military will accept. Do you want mil-spec parts?

  2. #122
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    Quote Originally Posted by Texas Hog Man View Post
    just an FYI for those looking at loading the 30 caliber 168grain CBB

    another member here is trying to work up a load for the 168CBB in his 16" 308 ---- he tried to use book data for same weight lead core bullets and came in WAAAY over pressure --- he then tried load data for a 168 barnes bullets and seems he is now in the right charge weight range

    the 6.8 CBB have been using book data for like lead core bullets and been OK, not sure this will be the case for all of the CBB

    Just remember guys, start low and work up---look for ANY pressure signs-- use a chrony to see if you are in the correct vicinity of speeds, and be careful and good luck
    Yes, only cases with limited capacity have shown to run charges with like lead bullets. 6.8, 6.5G, .277WLV etc.
    Do not just load and go with any bullets.
    .308, Creedmoor, .270 Win etc stick to book charges for monolithic bullets.
    ALWAYS start with like solid copper bullet charges with ANY of our bullets and work up to the charge for YOUR barrel.

    Thank you
    Cavity Back Bullets

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  3. #123
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    After searching for an accurate load for the 105 MKZ's for my 11.5" Black Hole Weaponry barrel, I did one trial for my 16" ARP SOCOM helical fluted barrel and was very happy to find that the exact same load was the most accurate for both. 28.5gr of H322 with a COAL of 2.285 in Hornady brass achieved an average of exactly 2600fps, and tiny clover-leaf 3-shot group with an outside measurement of .418" and ~.220" from center to center at 50 meters ('cause that's my zero). These were simply shot with my range bag as a front-end stabilizer, using a 1-6x Kahles optic in ~7mph wind, 45-degrees left-to-right from behind me. I did not get a velocity reading on my 11.5", due to my equipment, but I hope this contributes.

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  5. #124
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    When I first purchased the 105 MKZ, it listed a G1 BC of .390; now the website lists the G1 as .325. Is this a change in the design or a correction? Fwiw, that's a significant change.

  6. #125
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    Yam- any idea on how long it will be till you start making .224 cal CBB bullets? Any idea what weight you are going to do for the 22's ?

  7. #126
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    Quote Originally Posted by stickman View Post
    When I first purchased the 105 MKZ, it listed a G1 BC of .390; now the website lists the G1 as .325. Is this a change in the design or a correction? Fwiw, that's a significant change.
    Software says it .390.
    Xmans testing puts it at .325
    I hate exaggerated BC like almost all the other bullet manufacturers list.
    So I went with the lower number after his test.

    With the 400 to 450 yard effective expansion range of this bullet BC is not really and issue.
    I could put a tip in it and raise the BC but then it wouldnt expand as well.
    Which would shorten the effective range.
    Cavity Back Bullets

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    The 6.8 SPCII, the best all around cartridge available in the AR15 platform.

  8. #127
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    Quote Originally Posted by Texas Hog Man View Post
    Yam- any idea on how long it will be till you start making .224 cal CBB bullets? Any idea what weight you are going to do for the 22's ?
    .224 it on the list however others are ahead of it. Perhaps by fall. Likely 60 to 65 grains and still stabilize in a 1:8 twist is what I am thinking.
    Cavity Back Bullets

    Home of custom precision CNC milled projectiles and more.

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    AR15 Performance
    IronWorks Tactical

    The 6.8 SPCII, the best all around cartridge available in the AR15 platform.

  9. #128
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    You gonna do any for 1:9 twist?, LOTS of 1:9 barrels out there too.

  10. #129
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    Quote Originally Posted by Yamaraja View Post
    Software says it .390.
    Xmans testing puts it at .325
    I hate exaggerated BC like almost all the other bullet manufacturers list.
    So I went with the lower number after his test...
    Fair enough. Thanks for the explanation.

  11. #130
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    Quote Originally Posted by Texas Hog Man View Post
    You gonna do any for 1:9 twist?, LOTS of 1:9 barrels out there too.
    I think most hunting .223/5.56 rifles have a 1:8 or tighter twist.
    The .223/5.56 market is there but its pretty flooded as well.
    If the heavier projectile is successful I will look at a lighter one also.
    Cavity Back Bullets

    Home of custom precision CNC milled projectiles and more.

    Affiliates:
    AR15 Performance
    IronWorks Tactical

    The 6.8 SPCII, the best all around cartridge available in the AR15 platform.


 

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