.303 British Ballistics — Velocity, Energy & Drop

Common uses: Hunting, Big Game

Specifications

Type	rifle (centerfire)
Typical load	180gr Federal Power-Shok JSP
Muzzle velocity	2460 fps
Muzzle energy	2419 ft-lb
Published G1 ballistic coefficient	0.328
Case length	56.4 mm
Overall length	78.1 mm
SAAMI max pressure	49000 PSI
Common twist rate	1:10"

.303 British Trajectory Table

Range (yd)	Velocity (fps)	Energy (ft-lb)	Drop (in)
0	2460	2418	-1.5
100	2202	1937	0
200	1960	1535	-5.7
300	1735	1202	-20.6
400	1530	936	-47
500	1351	729	-88.3

.303 British Extended Ballistics (to 1,000 yd)

At 1,000 yards, .303 British (180gr at 2460 fps, 100 yd zero, standard conditions) has a modeled come-up of about 65.0 MOA / 18.9 MIL, retaining 905 fps (subsonic).

Range (yd)	Velocity (fps)	State	Drop (in)	Elev (MOA)	Elev (MIL)
300	1735	Supersonic	-20.6	6.5	1.90
400	1530	Supersonic	-47.0	11.2	3.26
500	1351	Supersonic	-88.3	16.9	4.91
600	1203	Transonic	-148.8	23.7	6.89
700	1092	Subsonic	-233.3	31.8	9.26
800	1013	Subsonic	-346.9	41.4	12.05
900	953	Subsonic	-494.5	52.5	15.26
1000	905	Subsonic	-680.3	65.0	18.90

Extended predictions beyond 500 yards are modeled from the same G1 engine — useful for initial DOPE, but outside the 500-yard manufacturer-table validation audit. Confirm with observed DOPE, especially near transonic.

Hunting Energy Reference

Retains about 1,000 ft-lb (deer-sized energy reference) to roughly 375 yd.
Retains about 1,500 ft-lb (elk-sized energy reference) to roughly 210 yd.

A retained-energy reference only — not a shoot/don't-shoot distance. Real effective range depends on your accuracy, shot placement, bullet construction, and conditions. The ~1,000 ft-lb (deer-sized) and ~1,500 ft-lb (elk-sized) figures are commonly cited rules of thumb, not standards.

Data & Sources

Representative load: 180gr Federal Power-Shok JSP
Velocity & BC: stored reference figures for the named factory load; verify against the manufacturer's current data
Trajectory & downrange energy: CaliberAtlas G1 point-mass model — validated against manufacturer centerfire tables to ~0.15 MOA at 500 yd
Conditions: 59°F · 29.92 inHg · sea level · 50% RH · 1.5″ sight height · 100 yd zero
Data updated: July 12, 2026

Your barrel, ammunition lot, and conditions will differ — always verify against the manufacturer's data and your own rifle.

Overview

A rimmed cartridge with a long and storied military pedigree, the .303 British remains popular today as a capable medium- and large-game hunting round, particularly across the former Commonwealth. Firing bullets typically in the 150- to 215-grain range at moderate velocities, it delivers ample energy for deer, boar, and larger animals at ordinary hunting distances while producing manageable recoil. Its rimmed design, a product of its 19th-century origins, feeds well in bolt-action and lever-style rifles but is less suited to modern magazine-fed box designs. Enormous surplus rifle availability and decades of factory production have kept it in circulation, though its rainbow-like trajectory at longer ranges reflects its age compared with modern high-velocity cartridges. It is best regarded as a dependable, hard-hitting woods and brush cartridge rather than a long-range precision round.

History

Adopted by the British military in 1888, the .303 British began as a black-powder load for the Lee-Metford rifle before transitioning to cordite smokeless powder in the early 1890s. It became the standard service cartridge of Britain and the Commonwealth for both rifles and machine guns, famously chambered in the Lee-Enfield, and reached its definitive form with the pointed 174-grain Mark VII ball load introduced in 1910. It saw front-line use through both World Wars before being replaced by the 7.62x51mm NATO round in the 1950s.

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