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Thread: BTSniper heavy 6.5mm 180 grain VLD bullet!!!

  1. #21
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    BT Sniper's Avatar
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    I'm not worried about friction or baring surface at the moment. It is shooting well.
    When you stop learning you are dying.

    Check out my vendor page for available products and prices!
    http://castboolits.gunloads.com/foru...?114-BT-Sniper

    Say hello on my new face book page!
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    Good shooting and swage on!

    Brian

  2. #22
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    I calculated bc numbers a while back, I'll have to look into it again and check against actual drop numbers on target at various range. I think the G7 bc number was around .350 an the G1 had to have been above .700

    BT
    When you stop learning you are dying.

    Check out my vendor page for available products and prices!
    http://castboolits.gunloads.com/foru...?114-BT-Sniper

    Say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

    Good shooting and swage on!

    Brian

  3. #23
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    BT Sniper's Avatar
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    Here is some various pics of the development of these 178 grain pills.


    300WM, 6.5WSM loaded long (I actually have to seat them .200" shorter then what is shown here do to the chamber throat), 178 grain bullet



    6mmBR and 6.5WSM



    cutting cores



    Bleeding cores



    Seating cores and forming boat tail



    400 yrd group, sighter in lower left, was impressed with next shot in bull! 3" group.




    600 yrd group, sighter low right hit stronger portion of steel, next three passed right threw.




    2.75" at 600 yrds, I was pretty happy for the first group shot with these bullets at this range.
    Last edited by BT Sniper; 08-21-2019 at 11:54 PM.
    When you stop learning you are dying.

    Check out my vendor page for available products and prices!
    http://castboolits.gunloads.com/foru...?114-BT-Sniper

    Say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

    Good shooting and swage on!

    Brian

  4. #24
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    Everyone I show these to seems concerned with the bearing surface, here is some numbers.......

    .635" bearing surface length BTSniper 178 grain (measured)
    .615" bearing surface length Hornady 140 grain SST (probably get to subtract a little for the cannalure) (measured)
    .545" bearing surface length Berger 156 EOL (data from Berger)

    Just to name a few. I could probably look up a few more bullet numbers.

    The diameter of my bullet is a little undersized at the start of the bearing surface at .2632" then increases to .2641" just in front of the pressure ring, and .2646" at the pressure ring. I did the same thing with my 6mm 130 grain bullet. This slight undersize at the start of the bearing surface I bet decreases a little of the drag while the full diameter towards the rear of the bearing surface and then the pressure ring ensure full engraving of the rifling and accuracy.

    BT
    Last edited by BT Sniper; 08-27-2019 at 03:38 PM.
    When you stop learning you are dying.

    Check out my vendor page for available products and prices!
    http://castboolits.gunloads.com/foru...?114-BT-Sniper

    Say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

    Good shooting and swage on!

    Brian

  5. #25
    Boolit Buddy Valornor's Avatar
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    Good info, thanks for sharing.

    If it shoots well, it's hard to argue for changes. Personally I think 2700fps is something of a sweet spot when it comes to ballistic performance and barrel life.

  6. #26
    Boolit Buddy M.A.D's Avatar
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    Mmmmm Thats one nifty looking round....

  7. #27
    Boolit Buddy M.A.D's Avatar
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    Quote Originally Posted by 475AR View Post
    If worried about friction you could always coat them with hexagonal boron nitride, tungsten disufide or moly. I would bet that Hi-tek coating would work as well. (I have coated several hundred jacketed and plated bullets and they all shot well.)
    You want to be very careful playing with HBN..... Not just breathing it in, But you dont want it on the Case Body/Chamber walls.. disastrous results can happen...

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check