Sectional Density & Inherent Accuracy


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ChristopherG
April 1, 2003, 11:12 AM
In this thread from a few months ago--

http://www.thehighroad.org/showthread.php?s=&threadid=2265

--Sven asked an interesting question about why bullet weights are what they are--e.g., for 9mm, 115, 124, & 147 grains. Turns out the answer is related to metrics (makes sense; they're in gram & half-gram increments).

My question is related but different, and will hopefully get responses that I'm barely able to understand from you aerodynamic whizzes out there:

Is there a particular range of sectional densities that have greater inherent accuracy within a given range of velocities (such as the normal range of handgun ballistics)? That is, all other things being equal, should a 158 gr. .38 and a 147 gr. 9mm and a 230 gr. 45 all be more or less accurate, in theory, than their lighter or heavier counterparts? Thanks for your answers, you ballistics brainiacs.
cg

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bogie
April 1, 2003, 11:29 AM
At handgun ranges, you're not likely to notice a difference between the "perfect" bullet, and a really bad one.

The MOST important thing about a bullet is how well the base seals in the bore, coupled with the integrity (or lack thereof) of the muzzle crown. If one side of the bullet loses contact with the barrel before the other one, the bullet yaws, and your accuracy goes to pot.

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