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The .338 RUM has almost the same capacity as the Lapua. The Norma has slightly less capacity as it is a shortened, 2.5", but improved case without the pronounced body taper of the Lapua. The 33Nosler does not claim to be the fastest but that it will fit a standard 3.34" magazine. Note that you could not rechamber a .338 Win to .33 Nosler (as the Nosler case is slightly shorter) without setting the barrel back a few threads.

.338 Norma specs ( COL is given for 300gr match bullet seated flush with base of neck. Hunting bullets could be seated for a COL of 3.34".)

Type Rifle
Place of origin Sweden
United States
Production history
Designer Jimmy Sloan, Norma
Manufacturer Norma
Produced 2009
Specifications
Parent case .416 Rigby
Case type Rimmed, bottleneck
Bullet diameter 8.60 mm (0.339 in)
Neck diameter 9.40 mm (0.370 in)
Shoulder diameter 14.50 mm (0.571 in)
Base diameter 14.87 mm (0.585 in)
Rim diameter 14.93 mm (0.588 in)
Rim thickness 1.52 mm (0.060 in)
Case length 63.30 mm (2.492 in)
Overall length 93.50 mm (3.681 in)
Case capacity 6.95 cm3 (107.3 gr H2O)
Rifling twist 235 mm (1 in 9.25 in)
Primer type Large rifle magnum
Maximum pressure 440.00 MPa (63,817 psi)

.338 Lapua specs

Type Rifle
Place of origin Finland
Service history
Used by Multiple official and civil users
Wars Afghanistan War
Iraq War
Production history
Designer Nammo Lapua Oy
Designed 1989
Produced 1989–present
Specifications
Parent case .416 Rigby, .338/416
Case type Rimless, bottleneck
Bullet diameter 8.58 mm (0.338 in)
Neck diameter 9.46 mm (0.372 in)
Shoulder diameter 13.82 mm (0.544 in)
Base diameter 14.91 mm (0.587 in)
Rim diameter 14.93 mm (0.588 in)
Rim thickness 1.52 mm (0.060 in)
Case length 69.20 mm (2.724 in)
Overall length 93.50 mm (3.681 in)
Case capacity 7.40 cm3 (114.2 gr H2O)
Rifling twist 254 mm (1-10")
Primer type Large rifle magnum
Maximum pressure 420.00 MPa (60,916 psi)

.338 RUM specs

Designer Remington
Designed 2000
Specifications
Parent case .300 Remington Ultra Magnum
Case type Beltless, rebated, bottleneck
Bullet diameter .338 in (8.6 mm)
Neck diameter .371 in (9.4 mm)
Shoulder diameter .5261 in (13.36 mm)
Base diameter .5500 in (13.97 mm)
Rim diameter .534 in (13.6 mm)
Case length 2.760 in (70.1 mm)
Overall length 3.600 in (91.4 mm)
Case capacity 113 gr H2O (7.3 cm3)
Rifling twist 1-10 in (254 mm)
Primer type Large rifle magnum
Maximum pressure 65,000 psi (450 MPa)

.338/378 Weatherby specs

Parent case .378 Weatherby Magnum
Case type Belted
Bullet diameter .338 in (8.6 mm)
Neck diameter .361 in (9.2 mm)
Shoulder diameter .560 in (14.2 mm)
Base diameter .582 in (14.8 mm)
Rim diameter .603 in (15.3 mm)
Rim thickness .059 in (1.5 mm)
Case length 2.905 in (73.8 mm)
Overall length 3.65 in (93 mm)
Case capacity 125 gr H2O (8.1 cm3)
Rifling twist 1 in 10
Primer type Magnum Rifle
Maximum pressure 63,817 psi (440.00 MPa)

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