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Old 11-01-2012, 11:20 PM   #1
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Join Date: Oct 2011
Location: Florida
Posts: 51
Brain Teaser (not)

I know this is a pistol forum...but I've been teaching a young man who shows awesome potential, stemming from his natural ability. Before I start letting him sling lead downrange...I've been 'schooling' him on the basics of ballistics. Here is a question I threw together to test his reasoning...see how many of you can answer it (without Googling it)..LOL

Question Setup: For best accuracy at a given range, barrels should be matched to a particular bullet type and weight and fired at an optimum velocity.

Question: Each bullet has a specific ballistic coefficient based on sectional density and aerodynamic coefficient. As the ballistic coefficient designation increases, will the ideal twist rate increase or decrease?

It's actually not a difficult question to answer...but I've never seen this asked in almost 60 years of shooting and the study of ballistics. HAVE FUN!
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Old 11-02-2012, 03:06 AM   #2
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Join Date: May 2006
Location: near Huntsville, Ala.
Posts: 707
IIRC, increasing ballistic coefficient results in a longer bullet if all other factors are equal. And such longer bullet requires a faster twist.

If some of the 'other factors' are not the same or essentially so, then sometimes the same or even slower twist is mandated.
Old 01-19-2013, 09:06 PM   #3
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Join Date: Oct 2011
Location: Florida
Posts: 51
Sorry Dave...I can't do that... (had to borrow that line...LOL)
No...the longer bullet needs a faster twist rate...just read the history of the 5.56 NATO round and the M-16...

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