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Thread: Pro Amm 150gr 7x64 Balistic info
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14-07-2019, 11:03 #1
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Pro Amm 150gr 7x64 Balistic info
I've tried Google and searching here.
Could only find this link posted before: http://admin.denel.co.za/uploads//Ri...Ballistics.pdf
But that chart doesn't show SD or BC for this ammo.
Anyone that can help please?
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14-07-2019, 11:59 #2
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Re: Pro Amm 150gr 7x64 Balistic info
BC = 0.36 according to QL.
SD is a formula and needs length and diameter. Google SD to get formula.
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14-07-2019, 12:11 #3
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Re: Pro Amm 150gr 7x64 Balistic info
Sorry, thinking of twist rate. Formula below but calculates SD = .266 for 150gr bullet.
https://www.vcalc.com/wiki/MichaelBa...tional+Density
Sectional Density (SD): The value is returned as a real number
The Math / Science
The mass is converted to pounds and the diameter to inches. The formula for sectional density is
SD = M/d˛
where:
- SD is the sectional density
- M is the mass of the projectile or bullet in pounds
- d is the diameter of the projectile or bullet in inches.
This calculator automatically converts grains, grams and other mass/weight units to pounds, and millimeters and other length units to inches. The resulting answer is provided with no units.
The sectional density as applied to a bullet is slightly different than the sectional density definition as applied in a general physics context. Sectional density in a general physics context is defined as mass per cross-sectional area. Sectional density is approximated as mass per diameter squared.
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14-07-2019, 12:14 #4
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