6BRA 6 primer test at 500 yards

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

  1. mikeeg02

    mikeeg02 Michael Glantz Gold $$ Contributor

    Joined:
    Dec 28, 2009
    Messages:
    711
    If the later statement was geared towards me, I apologize, and I wasnt inferring anything by my questions. The answers to my questions direct me and help eliminate variables for me on how I would read your targets. All in all, I would say good shooting, and it looks like you're on the right track. But I would still also further test the S&B load if it was me. I agree with you and think its good to retest the bottom two like you are. But again, it was just my opinion on how I would read your target. I am always curious to see how others would read the same information, and my targets as well. Sometimes you see the thought process another person thinks, and sometimes it "clicks". Regardless, good shooting.
     
    Down South and SPJ like this.
  2. abersfelderami

    abersfelderami

    Joined:
    Feb 9, 2015
    Messages:
    31
    First of all, all the groups are good anyway. To be clear, I meant add or subtract 1-2 kernel which should rotate(clock) your grouping 90 degrees, the group size will probably stay the same, but it's also possible that tomorrow ("weather") the same load could change to horizontal without doing anything. Sorry for the confusion.
     
  3. Thumper

    Thumper Silver $$ Contributor

    Joined:
    Feb 12, 2014
    Messages:
    95
    Those are great groups for 500 yards. well done!!! Thank you for sharing your test results.
     
    SPJ likes this.
  4. 270 ftw

    270 ftw

    Joined:
    Dec 14, 2018
    Messages:
    51
    All sub 1/2 MOA! Thats awesome. We need more of this kind of testing from people who if they can shoot like that obviously know what they are doing. Keep it coming!

    Quick question...you mentioned being 5-6 fps over you optimal speed. What was it that indicated that to you? Something in the groups? Or from previous testing?

    What happens at 5-6 fps slower? The groups get even smaller or better sd/es or both? Thanks in advance
     
    Last edited: Apr 6, 2019
  5. JamesnTN

    JamesnTN Silver $$ Contributor

    Joined:
    Nov 22, 2004
    Messages:
    1,798

    The prior tuning best accuracy was at a slightly lower velocity so that’s where I based the node for and load from the prior tests. So with the higher humidity and slightly higher temps I noticed the velocities had also increased.
     
  6. Rushty

    Rushty Silver $$ Contributor

    Joined:
    Nov 28, 2013
    Messages:
    1,304
    I’ve seen similar speed changes with my BRAs tuning first light in cool conditions to shooting a match in the middle of the day which increased velocity, mostly it held tune but on a couple of occasions I felt it was out of the sweet spot..
     
    SPJ likes this.
  7. Gilbert Garza

    Gilbert Garza

    Joined:
    Feb 8, 2018
    Messages:
    103
    Is this cause of powder or are BRA’s more susceptible to velocity changes with temperature changes ?
     
  8. Rushty

    Rushty Silver $$ Contributor

    Joined:
    Nov 28, 2013
    Messages:
    1,304
    Maybe both? I can’t really say with 100% certainly...I’m only on my second barrel but I know my last Dasher behaved in a similar way but worse..
     
    Gilbert Garza likes this.
  9. BartsBullets

    BartsBullets Gold $$ Contributor

    Joined:
    Mar 5, 2015
    Messages:
    1,421
    Its the Powder, not the Caliber! How much change in velocity a tune can take is determined by the barrel. Some barrels will give you a large window, while others won’t .


    Bart
     
  10. jackson1

    jackson1 Silver $$ Contributor

    Joined:
    Dec 1, 2017
    Messages:
    220
    JamesnTN. just want to thank you for your research and for allowing me to stand on your foot (I didn't say shoulders because I am not that good yet).
     
    BartsBullets likes this.
  11. Northridge

    Northridge

    Joined:
    Jun 4, 2014
    Messages:
    359
    I agree with Bart here for the most part but I do find in my own testing that even though velocity will sag or pick up a bit the bigger failure for me and others often will be "static bag grip" from a humid morning to a mid day less humid situation where bag glide improves and static grip or bag break away is reduced creating a different shape or result on paper simply because of this situation. everything plays a role in how a platform will develop grouping or shape or how long tune will hold interesting enough, that's what makes it fun for me I spose. As Bart mentioned and it is of my opinion some powders usually quicker per burn rate will show less trouble in a slight velocity sag or increase Vs slightly slower options on a chart, at least at long range short range would defiantly be a altered discussion.

    Shawn Williams
     
    Hoodoo and Rushty like this.

Share This Page