Sierra's 3 BC's

Discussion in 'Reloading' started by rwintuc, Jul 25, 2009.

  1. rwintuc

    rwintuc Member

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    Mar 25, 2009
    After several hundred trial and error loads I found one that realy shoots nice in my gun, but I dont know which of Sierra's BC's to use.

    300 WSM
    155g SMK
    3158 fps

    Tactical shooting starting at 800yd's and moving in until 50yd's is reached.

    My ballistical software only takes one.

    Thanks,
     
  2. RockZ

    RockZ Well-Known Member

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    Mar 10, 2006
    Since you are shooting at a high velocity use the highest bc. This will give you a good approximation of performance and get you on paper.
    Next, get out and shoot the load and get your actual drops. Now you can tweak the bc to correspond with your real life performance.
    I use a ballistics software than actually uses all 3 bc's.
     
    Last edited: Jul 27, 2009

  3. jmason

    jmason Well-Known Member

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    What software are you using?
     
  4. rwintuc

    rwintuc Member

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    Mar 25, 2009
    I am using Shoot! V3.2. Near as i can tell it uses G1 BC and has been right on the money for all the shooting I have done previosly.

    I also use the 5.11 tactical watch with Hourus Vision Software in the field as primary doping instument and a data card secondaraly.
     
  5. JLM

    JLM Member

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    Jan 23, 2009
    I would suggest using JBM and for whatever bullet you are using pick the "Litz" option from drop down box as that uses a G7 BC that Bryan came up with.