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2000-06-30
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DOCUMENTATION FOR BULLET80.CAL
This worksheet is the work of Chip Stratton, Dallas, Tx. I adapted it
to run under SuperCalc v1.05 from the Symphony IBM version. His original
documentation follows this note. Hope you enjoy Chip's work.
Chuck Cotham
41 L.O.G
Nederland,Tx.
DOCUMENTATION FOR BULLET
This worksheet will enable the rifleman to make trajectory predictions
given basic starting information. It can be particulary useful for
deciding the optimum range for sighting-in a given rifle and cartridge
combination. It will also allow one to make various changes in
parameters such as scope height, muzzle velocity, crosswind, ect. for
easy comparisons of different combinations. Following is an explanation
of the various data fields.
CARTRIDGE - This is for reference only, and is not used in calculations.
BULLET WEIGHT - This only affects the energy calculation. Enter the
weight of the bullet under consideration.
BULLET TYPE - For reference only, not used in calculations.
BALLISTIC COEFF. - This is a number that describes the ability of
the bullet to travel through air, and can be found in reloading
handbooks and bullet manufacturer literature. It is critical
to trajectory calculations. If you are unable to find out the
number for the particular bullet you are using, use the listed
bullets below for reference. Most factory bullets are either
spitzer or round nose types.
MUZZLE VELOCITY - Enter the published or hypothesized muzzle velocity
for your cartridge here. This is critical to all subsequent
calculations and can be found in cartridge manufacturer literature.
An increase or decrease will affect downrange energy and drop.
SIGHT IN - This is the range at which you want your rife zeroed in.
You may enter any range you wish, and can see where the bullet will be
both up and down range from this point (BUL PATH).
SCOPE HT. - This is the distance your scope's axis lies above the rifle
bore. Most are .9" to 1.5". This affects only the BUL PATH calculation.
ANGLE - This is the angle up or down from a level shot (e.g. up a
mountain). It will affect DROP and BUL PATH only.
CROSSWIND - This is a component of the wind that is at 90 degrees to
the bullet's path. It is used to calculate drift downrange.
DISTANCE - Yards downrange from rifle. Note that these can be changed
at will. If 0 yards is entered, you may note the velocity is not
exactly equal to the muzzle velocity - this reflects small errors in
the velocity formula, but the errors are small.
VELOCITY - Calculated from muzzle velocity, distance, and the bullet's
ballastic coefficient.
ENERGY - Calculated from velocity at given range and bullet weight.
FLT TIME - Time from leaving muzzle to arrival at given distance.
DROP - Drop from line of bore. This is independent of scope or sight
settings, though affected by ANGLE.
BUL PATH - This is the distance of the bullet below or above the line
of sight at a given distance. Dependent on muzzle velocity, ballistic
coefficient, sight height, and angle.
BUL DRIFT - The drift induced by crosswind component at given range.
The trajectories calculated are valid for muzzle velocities from
1500 to 5000 feet per second. Outside of this range, error will
increase. Formulas were taken from :
NOSLER RELOADING MANUAL NUMBER TWO, 1981 pp298-300 and from
"Practical Ballistics", The RIFLE magazine, pp40-42, May-June 1970
*********************************************************************
.22cal 50gr spitzer .244 60gr spitzer .290
.24cal 85gr spitzer .375 100gr spitzer .381
.25cal 100gr spitzer .409 120gr spitzer .471
.264cal 120gr spitzer .422 140gr spitzer .491
.277cal 100gr spitzer .315 130gr spitzer .400
150gr spitzer .482 160gr semi-spit .435
.284cal 120gr spitzer .434 150gr spitzer .520
175gr semi-spitz partition .508
.308cal 150gr spitz boat tail .408 150gr spitz partition .370
180gr spitz boat tail .507 180gr spitz partition .355
180gr semi-spitz part. .355 200gr spitz partition .584
.338cal 210gr spitz partition .386 250gr roundnose part. .364
Above examples are of NOSLER hunting bullets, and will vary somewhat
from bullets of other manufacturers.
**********************************************************************
Below are coefficients for some REMINGTON bullets, these numbers
were obtained by working backwards with this spreadsheet using
factory published ballistic tables.
.22cal 50gr psp .20 55gr psp .23
.243cal 80gr psp .30 100gr psp .40
.25cal 100gr psp .32 120gr psp .40
.277cal 100gr psp .28 130gr psp .37
.284cal 150gr psp .37 180gr psp .52
.308cal 125gr psp .30 150gr sp .21 150gr psp .35
170gr sp .27 180gr psp .42 220gr sp .32
.32cal 185gr psp .32 220gr psp .40
SP= soft point (e.g. round nose) PSP= pointed soft point
**********************************************************************
You may send futher inquiries via MCI Mail. Hope you enjoy
the spreadsheet. Chip Stratton, Dallas,Tx 11/85
**************
You may send futher inquiries via MCI Mail. Hope you enjoy
the spreadsheet. Chip Str