6BRA load data

Discussion in '6BR, 6BR Improved & Wildcats' started by Alex Wheeler, May 6, 2018.

  1. Jefferson

    Jefferson

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    right load for that barrel


    very good point some need to fully understand in order to get the most from their dream rifle build

    thanks for being so helpful to us all as some do not fully understand how things really work or how results are achieved through hard work

    Jeff
     
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  2. Curious

    Curious

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    How would Average Joe tell the difference as opposed to thinking his barrel was either bad or it just didn't like that powder?
     
  3. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    You try different powders. If you can get the barrel to shoot with other powders, then you either just go with them or get another lot of h4895.
     
  4. Curious

    Curious

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    Im really struggling to get my head around the fact H4895 could be that problematic. Are you working on single tub variations or batch numbers?

    I usually blend all my powder of the same type together before starting a load development to even things out.
     
  5. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    I have worked more than a few guys through it and when you get a bad lot it will shoot terrible. Luckily there are plenty of other choices. 8208 being another excellent option.
     
  6. 6.5creed

    6.5creed Gold $$ Contributor

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    I think I have my 6 BRA tuned, just like @Alex Wheeler called it 30.6 H4895 -.005 off with a 105 Berger HVLD and CCI 450's

    2955 fps SD 1 ES 1 on three shots over a Magnetospeed

    Testing seating depth this evening shot a 1.3" three shot group @ 1000
     

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  7. Chuckhunter

    Chuckhunter

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    Came across an old Mec bottle full of T-4895, approx. 2 lbs. may have to give that a whirl thru the Bra, just to see what it will do.
     
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  8. dedeadeye

    dedeadeye Gold $$ Contributor

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    Go for it Chuck. That T powder might be the holy grail of H4895. Back in the day I think the hot shooters were paying $100.00 a pound for the stuff. That was really hot (burn rate) so start low.
    Roger
    PS: If I were you I would swerl in back and forth from can to can 4-5 times. Give it some air. It has been sitting for a long time.
     
    Last edited: Jul 7, 2018
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  9. jamesdmock

    jamesdmock Gold $$ Contributor

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    Since I had some success with 8208 XBR and Berger 87 gr VLD"s at 300 yards last Sat., I am going to test it with 105 gr. Bart's Infinity VLD. My problem is that there is no available data for this powder with 105 gr. bullets. I extrapolated ( or perhaps interpolated;)) a trial load. It consists of 30.2 gr. of XBR/Bart's Infinity/CCI 400 and three seating depths. 1).005 into the lands, 2) just touching the lands, and 3) .005 off the lands. I hope that I don't blow up my rifle in this 95 degree Louisiana weather. Good shooting....James
     
  10. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    You should find it between 30 and 31 James. You'll probably be a little light at 30.2 but let us know.
     
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  11. jamesdmock

    jamesdmock Gold $$ Contributor

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    Thanks Alex. I just bought a new 8# jug of H4895, and then I read about all of the problems people are having with different lots of this powder and I am afraid to open it. Maybe I will break out the old Oehler and check this new lot against my old lot of H 4895. Good shooting....James PS- I have shot a lot of H 4895 in many different chamberings from .222 to .30/06 and never had a problem before. It is one of my all time favorite powders.
     
  12. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    You wont know until you try :)
     
  13. jamesdmock

    jamesdmock Gold $$ Contributor

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    I shot a few rounds over my old Oehler 35 today. This chronograph tends to show slower than other chronos to which I have compared, but it does give me some "relative" data. Today I shot some Bart's 105 Infinities that I pulled from Dasher loads. I started with 30.2 gr 8208 XBR which was very accurate but slow. (2840 @ .005 into lands this load had an sd of 7). Next, I tried 30.6 gr. of H 4895 (my older lot) and got 2913 w/ sd of 5. Finally, I used 31.6 gr. of Varget and got 2892 w/ an sd of 7. All of these velocities were with bullets seated .005 into lands. I tried some just touching and some .005 off the lands but all of these were a few fps slower.

    Now I am going to try my new lot of H4895 and see if it will give both velocity and accuracy.
     
  14. mikeeg02

    mikeeg02 Michael Glantz Silver $$ Contributor

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    James-

    I am curious what brand/model barrel are you using? PM if you prefer.
     
  15. jamesdmock

    jamesdmock Gold $$ Contributor

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    This is a Brux .236/.243 cut to 28 inches. This chrono has been "slow" with several barrels.
     
  16. JohnMill

    JohnMill Gold $$ Contributor

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    We will expect to see your name in lighhts very soon. Congrats.
     
  17. Clucknmoan

    Clucknmoan Silver $$ Contributor

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    Finally have some data to contribute.

    Rifle specs; Curtis Axiom action, MPA Comp chassis, TT trigger, 28" Brux 7.5 twist, MBM Beast brake, Athlon Cronus. Chambered by the infamous Nathan at MBM.

    Fireforming load for 105 hybrids was 29.1 gr of H4895 @ 2840, .005 jump. Shot this pretty well, nothing to write home about but didnt work it much either.

    Fireforming load for 110 SMK's is 29.1 gr H4895 @ 2790, .015 jump. This shoots very well, in fact is shoots a wide charge range well with the 110's .015 off.

    First 6 SMK'S ever down the barrel. Low one is a semi clean bore, just swabbed it. The next 5 went in the hole above from 28.6 to 29.4 gr in .02 gr incriments. This is at my home range, 135 yards so that would be about .13 @ 100.

    20180730_212946.jpg

    Had about 170 rounds down it, figured it had settled in, so I spent the last 30 fireforming rounds doing a final seating depth test. Hardest part was trying to find a charge it didnt shoot well so I could see a difference in the depth test!
    20180820_163419.jpg

    Now on to fireformed load, I don't think it will take long. Extremely happy with the cartridge, very enjoyable to shoot. And a big thanks to Nathan, great guy and obviously knows how to cut a chamber.
     
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