Multi-Bullet Comparative Analysis

Performance
Envelope

Compare any number of bullets side by side on elevation, wind hold, transonic transition, and the range at which each one stops carrying enough velocity to expand. Spin drift and Coriolis are optional.

Atmosphere

Temperature

°F

Pressure Source

Station pressure is what a Kestrel reads. Do not use an altimeter setting corrected to sea level.

Station Pressure

inHg

Relative Humidity

Solution Setup

Max Range

1760 yd is one mile.

Range Step

Table row spacing. Charts always use a fine grid.

Zero Range

Sight Height

Optic centre above bore axis.

Wind

Wind Speeds

mph

Comma separated. Full value from the left, so drift is to the right. Up to six values.

Hold Units

Corrections

Optional Spin Drift Coriolis Spin drift needs twist, diameter, and bullet length per bullet. Coriolis needs latitude and firing azimuth.

Bullets

Range Envelope

Group by barrel length

Sort

Supersonic Transonic (Mach 1.2 to 1.0) Subsonic Expansion limit

Summary

Charts

Elevation

Retained Velocity, Transonic Band, Expansion Floors

Squares mark Mach 1.2. Circles mark the point where each bullet drops below its own minimum expansion velocity.

Wind Hold

Trajectory Spread

Range Cards

Bottom Line

What This Model Does Not Include

Subsonic and transonic figures are soft. Below roughly Mach 1.2 the G7 and G1 reference shapes stop describing a real bullet well, and true BC degrades in ways a single number cannot capture. Treat anything past the transonic marker as a starting point to verify on steel, not a firing solution.
BC is treated as constant. Published G7 values are averaged over a supersonic band. Low muzzle velocities also see more shot to shot BC variation than the published figure suggests.
Expansion velocity is a guideline, not a hard edge. The figure is either published by the manufacturer or derived by shooters from their own terminal testing, and neither is a specification. Manufacturers frequently publish nothing for target bullets, so a number taken from recovered bullets, gel, or observed results on game is often the only one available. Terminal behaviour also degrades gradually rather than switching off, so the number you enter marks where the bullet stops being reliable, not where it stops working entirely.
Level fire through uniform air. The target sits at the shooter's elevation and the atmosphere does not change between muzzle and target. Steep angle fire and large elevation changes downrange need a different treatment.
Aerodynamic jump is not applied here. The ballistic calculator page handles it if you need it.