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

  1. #21
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    I'm not worried about friction or baring surface at the moment. It is shooting well.
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  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
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  3. #23
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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.
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  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.
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  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...

  8. #28
    Boolit Master mtnman31's Avatar
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    How's the load work coming with these? Any updates on their performance?

  9. #29
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    Just got back from deer hunting trip. Was hoping to get some terminal performance results but didn't see any horns entire season. Oregon deer numbers are very low it seems. Elk season starts in a week. Will be out shooting it some more before then. So far target work has been pretty good. Found some slight temp variation with my RL-33 loads affecting fps ever so slightly, but need to do more shooting to verify. Did a bit of shooting with it at 400 before deer season and was easily hitting small clangers about 6" wide by 18" tall (just approximate guess on size, I didn't walk down to measure).

    So far the bullets and cartridge have been shooting above any and all my expectations, wish I had more to report, just have not had the time yet. Did get to the point now I am firing fire formed brass. Loaded up to 66.5 grains of RL-33 for the cold weather in hopes to get back to the accuracy I had at warmer temp with 65.5 grains. These are pretty stout loads and need to do a bit more load development.

    I'll keep posted hopefully with a bit more shooting before elk season starts in a week.

    BT
    Last edited by BT Sniper; 10-11-2019 at 12:27 AM.
    BTSNIPER 2019 END OF YEAR SALES!
    check following link for great deals!
    http://castboolits.gunloads.com/show...04#post4758404

    also check in and say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

  10. #30
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    My second outing with load development showed good results with 65.5 grains of powder at 3020 fps.

    For some reason the next time I went out with this load it showed a beautiful horizontal group, the vertical spread on these 4 shots was less then 1/4" at 200 yards yet horizontal was about 2", it was a perfect little row of bullet holes, got a pic of it I'll have to post. I thought it a bit strange. I checked fps and compared these results to previous outing. What I found was the horizontal group was there before with the 64.5 grain load. It also showed the same slightly slower 2998 fps. The only thing I could figure was the difference in temp of about 10-15 degrees cooler outside must have slowed things down slightly knocking me off my accuracy node. I wouldn't think 10 degrees should affect that much and haven't heard RL-33 to be that temp sensitive???? It certainly was interesting and again, I'll have to do a bit more shooting to test this out.
    BTSNIPER 2019 END OF YEAR SALES!
    check following link for great deals!
    http://castboolits.gunloads.com/show...04#post4758404

    also check in and say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

  11. #31
    Boolit Buddy hockeynick39's Avatar
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    Very interested in this thread. Please keep us posted, thank you.

  12. #32
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    Finally uploaded a video that shows a bit of my shooting with this bullet on a 6" target at 750 yrds! Video has a lot of other great BTSniper swage on it too.

    Enjoy

    https://www.youtube.com/watch?v=kwNQ...ature=youtu.be

    BT

    Ah... Heck! All that work and I misspelled "Confidence" in the opening credits! I never claimed to be good at spellen, might as well just call me confi"dunce"
    Last edited by BT Sniper; 11-08-2019 at 03:58 AM.
    BTSNIPER 2019 END OF YEAR SALES!
    check following link for great deals!
    http://castboolits.gunloads.com/show...04#post4758404

    also check in and say hello on my new face book page!
    https://www.facebook.com/BTSniper-153949954674572/

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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