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Thread: Massive variation?

  1. #1
    Join Date
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    Massive variation?

    I'm loading some .38 sp and getting huge variation in power. I am using home cast 158gr bullets with vectan A1 powder.
    With 4.5 grain I am getting 122- 230 ft/lb, so I upped it to 5gr and am getting 166 - 280.
    I am using a LMBR chrono in the cellar, could this be a lighting/smoke issue? I can't use the pistol in the garden and was loading some up for the range tomorrow. Should I just retest in daylight then, or could it be something else?

  2. #2
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    reckon it is your light set up....can you not try led?
    email...... stephenbarrow@ntlworld.com
    3 bed static at thornwick bay to let 2016....pm for details

  3. #3
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    Quote Originally Posted by loiner1965 View Post
    reckon it is your light set up....can you not try led?
    Not tonight. I will try dYlight in the morning

  4. #4
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    The lmbr isnít overly sensitive to ambient light as it is self contained. I have my two mounted in wooden boxes with a plastic barrel guide set a few inches back. Smoke and blast really upsets the reading from too close. Try moving back a foot or two.
    DesG
    "Si vis pacem, para bellum !"

  5. #5
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    Steel plate in the back to trap airgun and rimfire. For anything else the plate is removed and shot into appropriate backstop. Yellow plastic lip is a barrel support and guide. I made a plastic lip to hold an aiming card for longer range shots.

    Atb
    DesG
    "Si vis pacem, para bellum !"

  6. #6
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    Thanks both. Stood further back with bright sunlight I got a spread of 922 - 989 fps. Not great, but close enough for jazz!

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