22lr bc ?

llama

January 04, 2012 05:51

My google-fu is weak today... have a rimfire steel plate match coming up, and i'd like to run some drop calculations but i'm having a hard time finding the BC of either a 40grn LRN or 38grn HP ... I've seen numbers from .10 to .15 on the LRN, which of course makes a fairly big difference...

help?

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  charliemeyer007

  January 04, 2012 12:36

  Here are 3 data points from cci. Happy curve fitting.
  http://www.cci-ammunition.com/products/detail.aspx?use=5&loadNo=0030

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  bpost

  January 04, 2012 16:06

  The standard velocity 40 grain load is more accurate at distance.

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  llama

  January 04, 2012 16:40

  quote:Originally posted by bpost
  The standard velocity 40 grain load is more accurate at distance.
  
  
  Yes, due to the transonic shift. Actually the rifle I'm planning on using *really* likes Remington sub sonic hps (38grn hp @ ~ 1080fps)
  
  But I don't have time between now and Sunday morning to actually do enough shooting to work out the drop tables.... looking to get a baseline w/ math

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