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New Terminal Testing Format

Discussion in 'Caliber Corner' started by Ljutic, Oct 13, 2012.

  1. Ljutic

    Ljutic

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    Jun 8, 2011

  2. WiskyT

    WiskyT Malcontent

    11,682
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    Jun 12, 2002
    North Carolina
    I can't speak to the gel results since I'm not any kind of an expert other than to say your gel obviously matches the factory tests in this example. You might run into issues with the chrono though. Eight feet is a little close. Many gun/ammo combinations might give good results at 8', but you can get weird numbers that close with combos that produce more blast. A snubby 357mag shooting a light bullet with slow powder might give you a string like 1,300, 1,275, 850, 1,700, 1,320. I chrono loads at 20 feet to avoid this.
     
  3. SCmasterblaster

    SCmasterblaster Millennium Member

    18,233
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    Sep 24, 1999
    Hartford, Vermont
    Why such a wide variation?
     
  4. unit1069

    unit1069

    8,155
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    Oct 10, 2007
    So. Central US
    tnoutdoors' test of the standard pressure 115-grain Gold Dot produced very impressive results also. As I recall he stated the results "complicates" the search for the optimum 9mm self-defense ammo. I was pleased because I happen to have half a box of it in my own inventory that I can use in the micro 9mm pistol that the maker cautions against shooting +P ammo.
     
  5. SCmasterblaster

    SCmasterblaster Millennium Member

    18,233
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    Sep 24, 1999
    Hartford, Vermont
    What is a "micro" nine-millimeter?
     
  6. WiskyT

    WiskyT Malcontent

    11,682
    1
    Jun 12, 2002
    North Carolina
    It's the muzzle blast. It fools the chrono. Some chronos are more sensative to it than others, and there is a big difference in amounts of blast from different calibers and loads. From time to time you will see threads where someone gets wild velocity spreads. Invariably they will defend their chrono testing by saying something along the lines of "I tested my chrono with my 22LR load and it was spot on". This means nothing since a 22:R out of a 22' barrel makes almost no blast at all. Most 9mm loads don't have a lot of blast and will chrono well at short distances, but try a 10mm or magnum load and you'll see your numbers go to ****.
     
  7. SCmasterblaster

    SCmasterblaster Millennium Member

    18,233
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    Sep 24, 1999
    Hartford, Vermont
    I figured that short-barrelled .357 Magnums actually had that kind of variation. But I suppose that your explanation makes sense. :cool:
     
  8. WiskyT

    WiskyT Malcontent

    11,682
    1
    Jun 12, 2002
    North Carolina
    No, a snubby 357 should have a reasonable extreme spread, say 60fps between the highest and lowest shots assuming the ammo was loaded properly. The extreme spreads you see in my example are from inaccurate chrono readings due to muzzle blast.
     
  9. Tiro Fijo

    Tiro Fijo

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    May 31, 2011
    It's a wonderful old round that many have forgotten about with all the new stuff. Truth be told, there is hardly any measureable difference between it, the 124 gr. & the 124 gr. +p Gold Dots in official four layer denim/ballistic gel tests. This round clocks over 1,200 fps in my G19, which shows that it is an efficient round as well.


    Nice test & nice gun. Thanks.
     
  10. unit1069

    unit1069

    8,155
    185
    Oct 10, 2007
    So. Central US
    A 9mm pistol that I can fit into a front pocket with care that has a grip small enough to stay hidden, although I normally carry IWB. A Glock sub-compact is too large to fit that description, for reference.
     
  11. M 7

    M 7

    1,398
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    May 22, 2012
    I really like the new clear gelatin that you are using- the ability to see what is going on/has happened in the block is a nice quality.
     
  12. Ljutic

    Ljutic

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    Jun 8, 2011
    I have a couple pair of pants and a holster that will make the G27 work front pocket. I love those pants. :supergrin:
     
  13. Ljutic

    Ljutic

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    Jun 8, 2011
    I started out using the CED M2 and that was all kinds of sensitive to muzzle blast even with little 380 and 32 ammo.

    The CE Digital has worked out great with very few false readings. It even catches flies that happen to pass over the sensors. Flies/bugs have been my biggest chronograph test spoiler. :rofl:
     
  14. SCmasterblaster

    SCmasterblaster Millennium Member

    18,233
    636
    Sep 24, 1999
    Hartford, Vermont
    I just looked at the Glock website. G26/27 are the micro-Glocks for sure.