What is the .303 British?

The .303 British is a factory rifle cartridge, introduced in 1887.

What bullet diameter does the .303 British use?

The .303 British uses a bullet diameter of 0.311 inches.

What is the case type of the .303 British?

The .303 British has a Rimmed Bottlenecked case type.

What primer does the .303 British use?

The .303 British uses a Large Rifle (.210") primer.

.303 British

Rifle Factory

Year	1887
Case Type	Rimmed Bottlenecked
Primer	Large Rifle (.210")

Dimensions (inches)

Bullet Ø	0.311
Case Length	2.21
Neck Ø	0.337
Shoulder Ø	0.402
Base Ø	0.458
Rim Ø	0.53
Total Length	3.05

SAAMI Pressure

MAP (PSI)	49,000
MAP (CUP)	45,000

Muzzle Velocity across 5 loads: Avg 2637 fps Min 2444 fps Max 2788 fps

Community Load Data

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Min MV (fps)

Max MV (fps)

⚠ MAX LOAD — Verify before loading

⚠ ABOVE SAAMI MAP — 53,100 PSI exceeds the 49,000 PSI limit

150.00gr Soft Point (SP) — 45.50gr

by imported_data · Aug 12, 2026

2788 fps

2.8583 OAL"

Sellier & Bellot Case

⚠ MAX LOAD — Verify before loading

⚠ ABOVE SAAMI MAP — 52,800 PSI exceeds the 49,000 PSI limit

180.00gr Full Metal Jacket (FMJ) — 42.40gr

by imported_data · Aug 12, 2026

2493 fps

3.0512 OAL"

Sellier & Bellot Case

⚠ MAX LOAD — Verify before loading

⚠ ABOVE SAAMI MAP — 52,400 PSI exceeds the 49,000 PSI limit

150.00gr Soft Point (SP) — 45.50gr

by imported_data · Aug 12, 2026

2755 fps

2.8583 OAL"

Sellier & Bellot Case

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⚠ MAX LOAD — Verify before loading

⚠ ABOVE SAAMI MAP — 52,200 PSI exceeds the 49,000 PSI limit

180.00gr Full Metal Jacket (FMJ) — 40.10gr

by imported_data · Aug 12, 2026

2444 fps

3.0500 OAL"

Sellier & Bellot Case

PRO

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⚠ MAX LOAD — Verify before loading

⚠ ABOVE SAAMI MAP — 52,200 PSI exceeds the 49,000 PSI limit

150.00gr Soft Point (SP) — 44.00gr

by imported_data · Aug 12, 2026

2706 fps

2.8600 OAL"

Sellier & Bellot Case

PRO

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PRO

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Cartridges with the same bullet diameter (0.311")