Henson Aluminum Tipped Bullet Testing

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Lightvarmint, Apr 1, 2009.

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  1. Lightvarmint

    Lightvarmint Guest

    Hello,

    We finally got some range time to test the 265s.

    Before I go any further, I want to apologize to Kirby because I gave him a hard time about shooting drops for BC with the Aluminum tipped high speed and low drag bullet profiles..... Kirby I apologize. After conferring with Dr Ken Oehler about them he advised us to not use chronographs for bullets that do not meet the standard drag profiles..... These and the other ones that were made in Canada do not follow the current drag profiles that are available to me.

    So, we shot some drops today. Back in December we zeroed the guns at 400 yards and then tested them at 600 just to get some trajectory information to use in the latter part of hunting season for meat expansion testing... The trajectory data was astounding and we decided not to publish it until we got some longer range drops performed.

    Mr Eddybo obtained some numbers with his testing and seemed suprised at the results as we were with our testing results.....

    Anyway, today we verified the 400 yard zero and then shot out to 928 on a vertical drop board. Todays results gave the same performance as the mid range testing back in December. Below is the range conditions and pertinant data. If someone could run these numbers and let us know what the results are, I would appreciate it.

    338 Lapua Improved (My 1995 design with the 30 Snyper brass from Bell Labs)

    1-10" twist

    400 yd zero

    265 gr

    3245 fps at muzzle

    2.13" sight height

    69.6 degrees F

    82% humidity

    82' above sea level

    29.84"Hg

    calm winds... Impact points were about 1.5" to the left of the aiming point. This is well inside one click on the Nightforce 12-42 NXS scope.

    At 928 yards the holes were -10.3 to -10.5 moa below the aiming point.

    All the shots today were cold bore shots and they were about 10-15 minutes apart. We let the barrel cool while we went down to the target board and marked the holes. Group size was 3.5". We let the barrel cool while we went down to the target board and marked the holes.

    Tomorrow the expansion tests will be performed at 928 on some phone books and newspaper I have been collecting for about 4 months.... This should not be a problem since the gun was grouping 3.5" at the 928 yard target board.
    Thanks in advance for the help.

    I think the 280s and the 300s will make our jaws drop open when we test them.

    Hurry up RG and get me some 280s and 300s for drop testing.

    James
     
  2. Michael Eichele

    Michael Eichele Well-Known Member

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    Good job.

    Do you have any drop info between 400 and 928?

    Thank you for apologizing to Mr Kirby. It is still many shooters opinion that the real drop method is very very reliable.

    I have been a long time fan of BC calculations by two methods. 1: 2 chronographs. 2: Real drop tests at 400, 600, 700, 800, 900 and 1K. The latter is my favoraite and IMHO the most reliable. At least for me. All 2 chronies tell you is the beggining velocity and the end velocity and NOTHING in between. This is why it is so hard to get a model this way. As long as you have an accurate zero and sight height and accurate velocities as well as air density it is scary accurate.

    This is also why the software I use doesnt use G1 or G5 etc......It uses a BC decay rate and is unlimited in the numbers you can use. This has been excellent for getting extremely close to matching real world drops versus program models.

    Based on a G1 model or .290 for my software, youre running 1.100.

    Was the pressure you stated at location or corrected for sea level??

    Thanks for sharing.
     
    Last edited: Apr 1, 2009

  3. Lightvarmint

    Lightvarmint Guest

    Hello,

    This may help.

    Additional data: Mirage was not present..... Very overcast and no waves in the scope.

    Intermediate range drops with 400 yard zero @ 600 = -3.5 MOA on the target board

    Intermediate range drops with 400 yard zero @602 = -3.5 MOA on the doe we shot in December.....


    James
     
  4. Michael Eichele

    Michael Eichele Well-Known Member

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    Using the standard .290 I come up with 3.6 MOA and 10.5. That puts it within one inch of real world data. I would need more drops to get a better model.

    One inch is as good as I have ever seen as I have NEVER seen caculated drops and real drops meet 100% but usually within 1-2" at the worst part of the trajectory.
     
  5. Lightvarmint

    Lightvarmint Guest

    M,

    Pressure was not corrected.

    It was station pressure at our location at the time of the shooting.

    WOW! 1.100 G1 equivalient BC with the Gen II 265s.

    I just can't wait until the Gen II 280s and the 300s get here for their testing..... I sure hope they studied for it.....

    James
     
    Last edited by a moderator: Apr 1, 2009
  6. Marine sniper

    Marine sniper Well-Known Member

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    Wow....
     
  7. bwaites

    bwaites Well-Known Member

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    So where can one buy these cool bullets?

    Bill
     
  8. Lightvarmint

    Lightvarmint Guest

    Bill,

    You can click on the ad banner when it cycles through or you can reach the bullet smith at:

    bullett33@hotmail.com

    Testing is never over...... We are going to shoot some of these in some LR matches..... We are in the process of purchasing a match winning 86 lb 1000 yard BR rifle built by the Kelblys with a barrel block and 37" Lilja barrel in the 340 Weatherby Improved caliber. We are also getting a custom LR front a rear rest designed for the heavy gun. Hopefully all will be done so that we can do some matches this year and kill some paper.


    James
     
    Last edited by a moderator: Apr 2, 2009
  9. bwaites

    bwaites Well-Known Member

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    Thanks!

    Just saw your location. I lived in Goose Creek when I was a little kid and my dad was stationed at Charleston Air Force Base. I have a cousin who still lives there, but for the life of me can't remember her married name!

    Bill
     
  10. Lightvarmint

    Lightvarmint Guest

    Bill,

    I spent the bulk of my Nuclear Navy career here in the Charleston area.

    When I retired from Navy Nuclear Power School, we just never left..... My wife teaches math at a local high school and is also a college math professor.

    She went to school at Baptist College and then got her masters from the Citadel.

    I am sure you remember those places.

    It is really a benenfit for me to be 10 minutes from my private 1000 yard range.... Just a short drive down US176 towards Holly Hill.

    If you get some bullets and follow the recommendations on the reverse of the invoice, you will probably like them.... I get calls all the time about them from shooters with velocity, accuracy and trajectory stories.... Guys who use them get excited very fast.

    If you ever come down and visit your cousin during non-deer season, we can shoot some long range targets with RG Henson's official HAT bullet test rifle.

    James
     
  11. bwaites

    bwaites Well-Known Member

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    James,

    Sounds great!

    There doesn't appear to be a web site to tell what bullets are available, or am I missing something?

    I was last back there in fall of 2007, went shooting with my cousins from up in the Columbia area. Mostly shorter range stuff, though. I didn't figure SC for being much into long range shooting, too much growth. Glad to hear some are finding places to shoot! The only places I saw that might work were powerline cuts! Most of my dads side live around Columbia, with only the one cousin down in Goose Creek.

    Bill
     
  12. Lightvarmint

    Lightvarmint Guest

    Bill,

    Drop him an email and he will send you all the data...... His website is not quite finished yet due to filling bullet orders and developing LR shotgun slugs.......

    James
     
  13. bwaites

    bwaites Well-Known Member

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    Did that already, anxiously awaiting!!

    Thanks for all your help!

    Bill
     
  14. Lightvarmint

    Lightvarmint Guest


    Bill,

    They just had a big storm and his power is out. He will get you an answer when he gets powered up again.

    James
     
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