Imperial
Metric
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Caliber List
?
Choose a pre-defined caliber to auto-fill common bullet characteristics.
.22 LR
.223 Rem / 5.56
.22-250 Rem
.243 Win
6mm Creedmoor
.25-06 Rem
6.5 Creedmoor
6.5 PRC
.270 Win
7mm-08 Rem
7mm Rem Mag
7.62x39mm
.308 Win / 7.62
.30-06 Springfield
.300 Win Mag
.300 PRC
.338 Lapua
.350 Legend
.45 ACP
.50 BMG
Diam (
in
)
?
Physical diameter of the bullet. Synced with Caliber List but can be overridden for custom loads.
Bullet Wt (
gr
)
?
Weight of the projectile. Affects how the bullet handles wind and gravity.
Barrel Len (
in
)
?
The length of the rifle's barrel. Affects calculated muzzle velocity.
Zero Range (
yd
)
?
The specific distance at which the sights are aligned with the bullet's path.
Sight Ht (
in
)
?
Vertical distance between the center of the barrel and the center of your optic.
Max Range (
yd
)
?
The maximum distance calculated and displayed on the chart and table.
Advanced Variables
BC Value
?
Ballistic Coefficient. Represents the bullet's aerodynamic efficiency.
Drag Model
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G1 is for standard flat-base bullets. G7 is more accurate for boat-tails.
G1
G7
Muzzle Vel (
fps
)
?
The speed of the bullet as it leaves the barrel. Crucial for calculating drop.
Temp (
°F
)
?
Air temperature. Cold air is denser and increases drag.
Altitude (
ft
)
?
Elevation above sea level. Higher altitude means thinner air and less drag.
Reset Defaults
Range (
yd
)
Drop (
in
)
Velocity (
fps
)