243 h1000 90gr

Discussion in '6mm, 6.5mm, and .25 Cal (Not 6BR)' started by vmaxpro, Feb 6, 2019.

  1. vmaxpro

    vmaxpro

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    Anybody ever try h1000 for a 90gr 243? I know its a little slow burning for that weight, id be happy with 3000fps if its accurate. Just curious
     
  2. Capt. Oblivious

    Capt. Oblivious

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    How long is your barrel?
     
  3. vmaxpro

    vmaxpro

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    26"
     
  4. Bojo

    Bojo

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    I tried it with a savage lrp 243 with 95 vld. Factory tube . Mine did not like it at 100 yards at all so I did not go any further.
     
    Last edited: Feb 6, 2019
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  5. Zero333

    Zero333 Silver $$ Contributor

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    You'll need around 48 gr of H-1000 to reach 3,000 fps with 90 grainers. Try loading some from 47 to 49 gr in 0.5gr increments and see if anything pans out. That's 5 loads.. 47 - 47.5 - 48 - 48.5 - 49

    You'll have to keep an eye out on the COAL with the compressed loads of H-1000.
    Might have to re-adjust the seating die with the higher loads, cause the compressed powder affects COAL. How compressed ??? it's all up to the chamber freebore /COAL, case capacity and bullet design.

    I've never had good luck with H-1000 in any 243win or any other cartridge for that matter.

    Years ago I had a good load with 90 gr Berger BT and 47 gr of H-4831sc.
     
    Last edited: Feb 6, 2019
  6. Plumsask

    Plumsask

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    Try some N-165, nice and cold burning- or some N-160. In my 6 Ackley both produced great raccuracy with the berger 87 hunting VLD with N-160 being a bit more accurate. N-165 has the edge towards Barrel life.
     
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  7. Idaho-Lefty

    Idaho-Lefty

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    YUP,.. N-160, shoots great with, the 87 grain V-Maxes ! Perfect Burn rate at, slightly slower and much "cooler" than, 4350 !
    I will be using it for, my 90 grain AccuBond load, too. N165 might be, too slow for, 87-90 gr bullets.
     
  8. vmaxpro

    vmaxpro

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    I will definitely try some 160! What kind of speeds are you getting with 87's?
     
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  9. jimbo88mm

    jimbo88mm

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    48grs of H1000 with 95gr SMK's and TMK's yields ~3080 fps out of my 243 with a 22in barrel.
     
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  10. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    N160. For all weights from 70 to 110.
     
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  11. Plumsask

    Plumsask

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    In the 6mm Ackley I am getting 3450 FPS with an 87 Gr berger hunting VLD, 49.5 Gr N-160. This is a mild load in my gun with a 1:8 twist and 26” barrel. Just happens to be too accurate to pass up- best of all worlds- accurate- good velocity- easy on brass.
     
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  12. Idaho-Lefty

    Idaho-Lefty

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    I have a 2017 Vihtavouri Loading Book that, shows Max loads from, 3,087 to 3,189 using, 85 grain to 90's in a 23", 1-10 twist barrel. This Info, should be available online, too. It is, Freezing, muddy, Windy and Cold, HERE, so I've not taken, the time to set up and Chrono,.. yet ! Still checking, loads/ groups for now ! Shoot an hour or, two at, "midday" and back, Home !
    N-160 seems to be, pretty "good stuff" for, the 70 to 90 grain "class" of bullets. Urbanrifleman, put me on to it ! Can be hard to find at times, tho! Good luck !
     
  13. vmaxpro

    vmaxpro

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    Just picked up 4lbs of n160 :)
     
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  14. Plumsask

    Plumsask

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    Woke up this morning to -43 Celsius- time to move ....
     
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  15. Texas10

    Texas10 Gold $$ Contributor

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    Your question about a very slow burning powder, in this case H1000 behind a light bullet brought to mind SEE or Secondary Explosion Effect, which typically occurs with light loads of slow powder, something you are not doing with your 243 loads.

    However, there is another possible cause of SEE besides light loads. The light bullet actually out accelerates the pressure front of a slow burning powder, briefly slows its acceleration until the pressure front catches up, where upon pressure spikes tremendously.

    Here is a link to the article I remembered: https://www.shootersforum.com/handl...tices/25851-slow-powder-pressure-caution.html

    Note the link to https://www.shootingsoftware.com/barrel.htm

    I think you're doing the right thing going with a faster powder. I had good success with IMR 4831 and 87 gr VMax in my 243.
     
    Last edited: Feb 12, 2019
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  16. vmaxpro

    vmaxpro

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    Texas10, very intresting read thank you!
     
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  17. Idaho-Lefty

    Idaho-Lefty

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    There is a LOT of Vihit factory Data, on N-160 for, 70-100 grain bullets,.. I LIKE, that !
    IMO Vihit, is a tad, "conservative". I load for accuracy NOT highest Velocity, but it's NICE when, you can get, both ! N-160 seems to do that, for my Rifle. I would personally AVOID, Retumbo and H-1000, in the .243 win. as they are VERY, "Slow" Burning and "could" pressure spike as noted, by Texas 10 in the post above. I WON'T risk it, as I LIKE,. my Rifle, Fingers and Eyes just the way, they ARE ! I "passed" on Retumbo for my .270 WSM for the same reason! Some people, have had success and a bit more Velocity but, I found great groups with, IMR 7828 at 3,150 FPS w/ 140 AB's and that was enough Vel for me, in the WSM.
     
    Last edited: Feb 12, 2019
  18. rafale

    rafale

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    I'm not agree about slow powder for 243. I have really good accuracy with a top charge of N 165 and 105grs class bullets.The high
    density load of N 165 or RS 70 works very well if you have a 30/32"barrel.

    Michel
     
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  19. Idaho-Lefty

    Idaho-Lefty

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    With a 30/32 inch long barrel's and using 105's -110's, I agree with, the switching to N-165. But, if you have a "Burn Rate" Chart, you will note that, N-165 is still quite a bit, "faster" burning than either,.. Retumbo or H-1000 ( Powders, which "could" suffer from Pressure "spikes", like Texas 10's post mentioned). In my Tikka T3, 1-10 22.4" barrel, I shoot lighter Bullets, 70-90 grains, thus the N-160.
     
    Last edited: Feb 12, 2019
  20. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    50.5-51 grains n160 with 70 tnts shoots bug holes but will blow up from a 1-8 twist because velocities are nearly 4000 fps.

    For 90s I would start at 45 and work up.

    I am testing 46.5 with 108 Bergers now. 3325fps

    20190127_214859.jpg

    Here is the 43. 5 lower node.

    20190127_214945.jpg
     
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