6BRA 6 primer test at 500 yards

Discussion in '6BR, 6BR Improved & Wildcats' started by JamesnTN, Apr 5, 2019.

  1. JamesnTN

    JamesnTN Silver $$ Contributor

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    After 4 days of testing powder charges seating depths and neck tension I came down to testing 6 primers at 500 yards for my final test in my 6 BRA at 500 yards this am.
    All stats are written down by each group. All 4 shots and I’ll retest the best 2 for best accuracy and consistency for 10 shots each.

    53C3FD48-B507-4AB0-A0A0-B51A7F514484.jpeg
     
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  2. SPJ

    SPJ Gold $$ Contributor

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    IMO
    You could final tune around any of those primers tested.
    The BR-4 look the closest
     
  3. Evan

    Evan Gold $$ Contributor

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    I like the 7.5, nice and flat.
     
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  4. WyleWD

    WyleWD Gold $$ Contributor

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    Wow! Interesting for sure. What scope are you using on that rifle on these tests? WD
     
  5. Joe Salt

    Joe Salt Silver $$ Contributor

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    Evan flat line say yes no vertical BUT there not shooting through the wind! Your looking for clusters.

    Joe Salt
     
  6. mikeeg02

    mikeeg02 Michael Glantz Gold $$ Contributor

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    Do you seat with an arbor press?

    Is it fair to assume you sorted your primers?

    Did you have wind flags?

    What primer did you do your initial load development with?

    Judging by the fact they are all in similar proximity to your aiming dots, I would dare to venture pretty calm conditions.

    The reason I ask about hand seating and primer sorting is the S&Bs look really promising, and the two out of the group could be neck tension related. Assuming that you seat by hand, and sorted the primers, that one could be tuned in by adding or subtracting a tenth or so of powder, maybe a little less.

    The above questions are also pointed towards the 450s test. Namely about the one that went high.

    The 400s looks like a pretty "round" group. As much as you can tell with 4 shots anyways.

    The 205s look like they are almost double grouping left and right. A little fine tuning could draw them together.

    The 7.5s may need a little tweeking in powder/seating to draw them together a little. They may print flat, but they are also a little wide. Could have been a condition, but also may need tuned in a little.

    Just my .02
     
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  7. Rope2horns

    Rope2horns Norm Harrold Silver $$ Contributor

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    Which primer was used for load development?

    Were these shot in a round robin fashion?
     
  8. R.Morehouse

    R.Morehouse Gold $$ Contributor

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    BR 4 ;)
     
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  9. Falfan2017

    Falfan2017 Gold $$ Contributor

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    Sellier bellot keeps coming out on top for me in similar tests. Lowest es as well as consistent grouping. However if you developed your load around a different primer you might want to test a couple tenths of a grain of powder in either direction with the sb
     
  10. Nature Boy

    Nature Boy Gold $$ Contributor

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    I always learn something from other people’s test results, especially when they are well organized and laid out clearly as this one.

    Thank you.

    I’d lean toward the CCI 400 or the BR4 with a tweak to bring them together but trying to understand what others see as promising with the other primers. Is there a consensus?
     
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  11. LitLBoy

    LitLBoy Silver $$ Contributor

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    Sure like to see the 400's in a ten shot string!
     
  12. Evan

    Evan Gold $$ Contributor

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    That was my thought. If a little tweaking on seating depth with that primer draws them all together, or the spread was a wind condition during shooting, then the Rem 7.5 could produce the smallest groups, particularly as you move out further to 1k for instance and that vertical in the others gets worse.

    Also point out that the Rem 7.5 gave you just a hair more speed than the others. Depending on where your node is, could that have pushed you to the edge of it? Should you back down the charge a tenth or two?
     
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  13. SPJ

    SPJ Gold $$ Contributor

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    One thing to keep in mind when testing multiple spots, is your set up changes each time you adjust to a different spot as well as wind conditions change during the test.
    Therefore if tested again first in the rotation in a very calm condition Fed 205 may provide the smallest group etc.
    Food for thought “
     
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  14. JamesnTN

    JamesnTN Silver $$ Contributor

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    Testing this morning was done over flags.
    The flags never moved or even twitched. I had as perfect conditions as I could of asked for. It was over cast so no mirage no wind no other shooters just me.
    Each shot was precisely shot at my pace and centered the best possible using the NF 15-55
    There was no round robin shots. Each four shot group was shot at one time moving onto the next primer.
    As for initial load testing I settled in on the S&B to finalize everything as it showed more promise over the 450m I also tried. I was actually surprised to had seen the higher ES and SD from that primer today along with the vertical shown.
    Each load was weighed to 1 kernel of powder. So I know that’s as good as I can weigh them. Each seating force was within 1# on the 21st century arbor press. Everything felt right for each and every shot fired today. Of course I could repeat the test tomorrow and it could be exact opposite to today. We can chase this forever. But tomorrow morning I’m going to test the BR4 and 400 primer.
    I was also about 5-6 FPS above what appeared to been my optimum velocity of 2943-2945 so I’ll test 5 shots of 31.0 and 5 of 31.1 and see what happens from there.
    I can only assume my velocities where higher due to the higher humidity and of course temps were 5* warmer this morning as well. It wasn’t far off but I noticed it.
     
  15. abersfelderami

    abersfelderami

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    S&B +1 or - 1 kernel.
     
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  16. JamesnTN

    JamesnTN Silver $$ Contributor

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    All charges +/- 1 kernel
     
  17. Falfan2017

    Falfan2017 Gold $$ Contributor

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    What bullet is this?
     
  18. Down South

    Down South FTR Junkie Gold $$ Contributor

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    Curious to see the results of the next test.
     
  19. newbieshooter

    newbieshooter :-) Silver $$ Contributor

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    Looks like pic shows Bart's 105 Hammers

    IMG_5288.PNG
     
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  20. Falfan2017

    Falfan2017 Gold $$ Contributor

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    Ah didn’t notice that. Had pretty good pressure signs when I tried to get to 31 with h4895 and hammers in the bra
     

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