What is the .338 Lapua Magnum?

The .338 Lapua Magnum is a factory rifle cartridge in the Lapua family, introduced in 1983, designed by Research Armament Co..

What bullet diameter does the .338 Lapua Magnum use?

The .338 Lapua Magnum uses a bullet diameter of 0.338 inches.

What is the case type of the .338 Lapua Magnum?

The .338 Lapua Magnum has a Rimless, Bottlenecked case type.

What primer does the .338 Lapua Magnum use?

The .338 Lapua Magnum uses a Large Rifle (.210") primer.

What cartridges are in the Lapua family?

The Lapua family includes the .338 Lapua Magnum and other related cartridges. Browse the full family on OpenCartridge.

.338 Lapua Magnum

Rifle Factory

Family	Lapua
Designer	Research Armament Co.
Year	1983
Case Type	Rimless, Bottlenecked
Primer	Large Rifle (.210")

Dimensions (inches)

Bullet Ø	0.338
Case Length	2.72
Neck Ø	0.365
Shoulder Ø	0.544
Base Ø	0.589
Rim Ø	0.586
Total Length	3.68

SAAMI Pressure

MAP (PSI)	65,000

Parent Cases

.416 Rigby

Muzzle Velocity across 6 loads: Avg 2695 fps Min 2624 fps Max 2755 fps

Community Load Data

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250.00gr Sierra Boat Tail Hollow Point (BTHP) — 84.90gr

by imported_data · Aug 12, 2026

2755 fps

3.6811 OAL"

Sellier & Bellot Case

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250.00gr Other — 81.80gr

by imported_data · Aug 12, 2026

2722 fps

3.6811 OAL"

Sellier & Bellot Case

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250.00gr Lapua Boat Tail Hollow Point (BTHP) — 84.90gr

by imported_data · Aug 12, 2026

2722 fps

3.6811 OAL"

Sellier & Bellot Case

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250.00gr Sierra Boat Tail Hollow Point (BTHP) — 79.50gr

by imported_data · Aug 12, 2026

2690 fps

3.6811 OAL"

Sellier & Bellot Case

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250.00gr Other — 75.60gr

by imported_data · Aug 12, 2026

2657 fps

3.6811 OAL"

Sellier & Bellot Case

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250.00gr Lapua Boat Tail Hollow Point (BTHP) — 74.10gr

by imported_data · Aug 12, 2026

2624 fps

3.6811 OAL"

Sellier & Bellot Case

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