Analyze this data please

Discussion in 'Reloading' started by BML, May 14, 2012.

  1. BML

    BML Well-Known Member

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    Just looking for some thoughts or opinions on this data. Shot all 12 rounds last Saturday morning. Conditions were good. No wind at all. Temps went from 55 to 70 during the testing. I gave the barrel anywhere from 5-10 minutes to cool in between shots. 5 to begin with and 10 towards the end as the barrel heated up more.

    Savage LRH 6.5x284
    Norma brass
    140 AMAX
    Federal 210 primer
    H4831SC
    OAL 3.05

    All in order from first shot to last.

    48.0 grains

    2786
    2774
    2780

    Average Velocity: 2780

    Group size: .789


    48.2 grains

    2797
    2771
    2788

    Average Velocity: 2785

    Group size: .639

    47.8 grains

    2783
    2777
    2787

    Average Velocity: 2782

    Group size: .733

    48.4 grains

    2791
    2796
    2796

    Average Velocity: 2794

    Group size: .952 (Two shots in same hole with one flyer)

    Let me know what you experts out there think, good or bad.

    Thank you!
     
  2. rscott5028

    rscott5028 Well-Known Member

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    Looks good.

    They all shot under an inch.

    Pick your best group and load up 9 rounds. Shoot 3x3 shot groups to see if it's consistent.

    Then, load/shoot a bunch of groups varying seating depth in .020" from about .010" jump to about .090".

    I assume this is a hunting rifle. So, 3 shot groups are fine. And, there's no point in jamming bullets or seating past mag length.

    -- richard
     

  3. Aldon

    Aldon Well-Known Member

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    I would try the last load again at the forefront of the trial as to reduce impact of fouling and heat and see if the group is accurate. The ES is very good albeit a very small sample and would be more robust load for long distances..... my .02

    I have found two on top with flyer to be difference in ogive contact point from bullet to bullet either due to bullet specifically or concentricity or quality of the workmanship on my part.
     
  4. Mikecr

    Mikecr Well-Known Member

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    Velocities are very low.
     
  5. BML

    BML Well-Known Member

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    Aldon,

    I planned on doing that next.

    Richard,

    I have a pretty bad free bore issue so I can't get as close to the lands as I would like. These particular loads were .075 off the lands. I might be able to get to .070 or maybe even .060 but I will have to remeasure everything and make sure I am still safe to seat them out that far.

    Mikecr,

    I realize the velocities are fairly low. For whatever reason my gun sprays bullets all over the place with any load over 49g. I know I am sacrificing some speed with this particular powder but I will still retain very good energy down range. I haven't punched in all the numbers yet but if I can get to 2800fps I think I will still have around 1000 pounds of energy at 800 yards. I'm ok with having an 800 yard limit.

    Thanks for all the tips so far.
     
  6. rscott5028

    rscott5028 Well-Known Member

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    I wouldn't worry too much about the velocity. But, to MikeCR's point, the cartridge has the potential to run around 3000 fps with those bullets in many rifles. But, I would definitely sacrifice some velocity in favor of accuracy if it came to that. Your barrel will thank you also.

    It doesn't matter what seating depth/jump/jam you end up with. My point was simply that you should test varying depths in a methodical manner.

    Ultimately, you want to lock everything down and make sure you get repeatable and desirable results at the distances you plan to hunt (and beyond).

    -- richard
     
  7. BML

    BML Well-Known Member

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    Point well taken.
     
  8. Joe King

    Joe King Well-Known Member

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