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millionmanus
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Bullet Coefficient
Mar 26th, 2015 at 9:38pm
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Trying to find a BC for some bullets, and after searching hi and low I am unable to find them. It is a Saeco #1881 mould, .458 / 405 grain round Tip, hollow base bullet. Any ideas what I should try the BC at? Or maybe know the BC is for this cast bullet?

thanks,
  
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JS47
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Re: Bullet Coefficient
Reply #1 - Mar 26th, 2015 at 10:16pm
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You might look in the  older Lyman cast bullet handbook and find a similar bullet.  Other than that, why worry about it?  Just shoot it and see what it does at different ranges.   

JS
  
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John Mead
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Re: Bullet Coefficient
Reply #2 - Mar 26th, 2015 at 10:49pm
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millionmanus
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Re: Bullet Coefficient
Reply #3 - Mar 27th, 2015 at 12:04am
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thanks for the info.
  
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Seanmp
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Re: Bullet Coefficient
Reply #4 - Mar 27th, 2015 at 12:36am
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I have the Lee 405gr hollow base round tip and the published data for it is .250

HTH
  
Sean
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Schuetzenmiester
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Re: Bullet Coefficient
Reply #5 - Mar 27th, 2015 at 3:14am
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Back in the late 80s early 90s, I did a lot of testing to get coefficients for various bullets for long range shooting. It isn't critical.  When it was all said and done, I used the same number for all the .45 bullets guys were coming up with.  Sight setting were always right on out to 1000 yards from Ohler'sw Ballastic Explorer.
  
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boats
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Re: Bullet Coefficient
Reply #6 - Mar 27th, 2015 at 11:37am
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I get all mine out of Lyman's Cast Bullet handbook, look for something similar. Like Schuetzenmaster said big heavy bullets not going real fast little difference one to the other.

This from observed strikes at distance.

Boats
  
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