Cartridges are indispensable to guns. Short article world war II, a change was saw in the ammunition market when a wide range of cartridges was being presented for varied purposes, varying from long-range hunting to military use.

You are watching: 300 remington ultra mag vs 338 lapua

In the sea of cartridges, .300 Remington Ultra Magnum (RUM) and also .338 Lapua Magnum room two standout performers in the arena the long-range shooting.

Both the cartridges room widely famous in long-range shooting owing to their specifications. However, there lie some differences with respect to size, weight, velocity, energy, and accuracy. These distinctions are as adheres to –

300 RUM:

Suited for the long-range shoot of approx 700-1000 meters.Lower recoilSmaller and also lighter bulletsShorter in its entirety length and case lengthRelatively cheaper Lesser power retention Relatively short Sectional thickness Higher muzzle velocityLower muzzle energyFlatter trajectory

.338 Lapua:

Suitable for also the excessive long-range shooting of approx 1500-1800 metersHigher recoilLonger and also heavier bulletsLonger as whole length and case lengthRelatively costlier More power retention Higher Sectional DensityLower muzzle velocityHigher muzzle energyLow wind deflection

Remington was presented in 1999 by Remington Arms, conversely, the Lapua was presented in 1989 by Lapua ltd. And also was used mainly as a long-range sniper round for military purposes.

(Remington 300 Left) (338 Lapua Right)

Specifications Table

Cartridge 300 REMINGTON338 LAPUA
Parent case404 Jeffery416 Rigby
Case typeBeltless, bottleneckRimless, bottleneck
Bullet diameter0.308 customs (7.8 mm)0.339 in (8.61 mm)
Neck diameter0.344 in (8.7 mm)0.372 in (9.46 mm)
Shoulder diameter0.525 in (13.3 mm)0.544 in (13.82 mm)
Base diameter0.550 in (14.0 mm)0.587 in (14.91 mm)
Rim diameter0.534 in (13.6 mm)0.588 in (14.93 mm)
Case length2.850 in (72.4 mm)2.724 in (69.20 mm)
Overall length3.600 in (91.4 mm)3.681 in (93.50 mm)
Case capacity110.2 gr H2O (7.14 cm3)116.24 gr H2O (7.532 cm3)
Maximum pressure65,000 psi60,916 psi

Shape and also Size

(338 Lapua)

The .300 RUM is a beltless, rebated pickled in salt cartridge with a strong potential for long-range shooting. It has actually an as whole length that 91.4 mm with a shoulder diameter of 13.3 mm and uses a in salt diameter the 13.6 mm. ~ above the various other hand, the .338 Lapua is a centerfire, flat-shooting cartridge designed solely for long-range shooting. It has actually a reasonably longer in its entirety length and a shoulder diameter which room 93.5 mm and 13.82 mm, respectively, and also it provides a in salt diameter that approx 14.93 mm.

The diameter the the RUM bullet is smaller sized than that of the Lapua. Hence, a smaller sized diameter, coupled through the reality that RUM’s maximum press is likewise more, a rum’s cartridge gets fired with a higher pressure.

But, due to much more case volume (116.24 vs 110.24), the Lapua deserve to shoot more heavier bullets at comparable speeds, despite this as well fetches a disadvantage of shorter barrel life. Since the Lapua has a bigger bullet diameter (of 8.6 mm) 보다 Remington (7.8 mm), it has actually a relatively large frontal surface area which eventually enhances accuracy.

.300 RUM is a rebated rim cartridge v its in salt diameter significantly smaller 보다 its base diameter, vice versa, .338 Lapua is a rimless cartridge who rim has precisely the same diameter together its base. This rebated rim might raise some problems with dependability feeding. However, having actually a beltless base through 30% shoulder offers an edge come Remington over Lapua.



Since both cartridges are for large-size rifles supplied for long-range shooting, lock are generally quite heavy. Yet, .300 RUM bullets space lighter than those that .338 Lapua.

The RUM bullets loss in the variety of 150 – 200 grains, with those that 150 grains, 180 grains, and 200 seed being more popular. On the other hand, the load of the Lapua bullets drops in the selection of 250-300 grains, through 270 grain, 280 grain, and 300 grain being more common. Thus, while the previous ones are an ext convenient to carry on large mountains and likewise give additional space to the preppers, the big weights that the last ensure minimal wind deflection and also a straighter trajectory.

The penetration of Lapua is greater than the Remington because of its high sectional density. The sectional density refers to the proportion of a bullet’s mass come the square that its diameter. Because there is not much difference in their bullet’s diameter, the heavyweight of Lapua increases its density. Other things being constant, a bullet with big sectional density expands and penetrates better.

Muzzle Velocity


Muzzle velocity is the velocity of the cartridge the moment it exit the muzzle the the gun. The plays an essential role in the overall performance the the bullet, specifically the range, accuracy, and terminal ballistics. A bullet with a greater muzzle velocity is likewise expected of a flatter trajectory v minimum deflection or deviation.

The muzzle velocity that a cartridge depends mostly on 3 determinants – the propellant’s quality (the chemical burn speed and also expansion) and also quantity, the fixed of the projectile, and the size of the barrel.

Although the Lapua to win the RUM in propellant due to more case capacity, the mass of the bullet gives an edge come the RUM end Lapua (assuming other components equal). So, if the maximum muzzle velocity that have the right to be accomplished with RUM is 1050 m/s (by utilizing a 150 seed bullet), that through Lapua is 920 m/s (even after making use of a bullet of 231 grains).

Muzzle Energy

Muzzle power is the kinetic energy of the cartridge at the moment it exits the barrel. A bullet’s terrible potential highly depends on its muzzle energy.

.338 Lapua bullets usually have an leaf on the .300 RUM in muzzle energy because they are heavier. The maximum muzzle energy that a RUM can generate is 5,723 J (in the situation of the 200 gr bullet, which is the heaviest cartridge for a RUM) while even the lightest bullet (of 231 gr) the a Lapua produces energy of 6348 J. The maximum energy that a Lapua deserve to generate is 6696 J (by making use of a 300 gr bullet). Hence, Lapua is undoubtedly far better than RUM in terms of muzzle energy.

Ballistic Performance

.300 RUM

CartridgeCriteriaMuzzle100-yard (91 m)200-yard (180 m)300-yard (270 m)400-yard (370 m)500-yard (460 m)
Premier Scirocco bonded 150 seed PR300UM5Velocity1,050 m/s979 m/s910 m/s844 m/s782 m/s722 m/s
Energy5374 J4656 J4023 J3463 J2970 J2534 J
Premier Scirocco external inspection 180 seed PR300UM3Velocity990 m/s930 m/s870 m/s816 m/s763 m/s711 m/s
Energy5723 J5042 J4431 J3883 J3391 J2952 J
Premier A-Frame 200 grains RS300UM2Velocity924 m/s851 m/s782 m/s717 m/s655 m/s596 m/s
Energy5534 J4697 J3964 J3340 J2778 J2298 J

.338 Lapua

CartridgeCriteriaMuzzle100 meters300 meters600 meters
Naturalis 231 GrainsVelocity920 m/s835 m/s674 m/s473 m/s
Energy6348 J5233 J3410 J1678 J
Scener 250 GrainVelocity905 m/s856 m/s762 m/s631 m/s
Energy6593 J5794 J4417 J2851 J
Armour piercing 248 GrainVelocity905 m/s848 m/s741 m/s595 m/s
Energy6593 J5794 J4417 J2851 J
Armour piercing 253 GrainVelocity895 m/s840 m/s735 m/s592 m/s
Energy6568 J5782 J4425 J2876 J
Scener 300 GrainVelocity830 m/s789 m/s712 m/s605 m/s
Energy6696 J6054 J4925 J3558 J

From the tables above, it is clear that Lapua bullets retain your energies an ext at much longer ranges. However, if we compare the velocities, RUM bullets do better. The is due to the fact that they have a smaller diameter and also are thus more aerodynamic.


The trajectory that a bullet is the bent path adhered to by the after being shot. It relies on number of factors, namely, muzzle velocity, air resistance, angle, form of the bullet, and also the temperature and pressure the air. All these add to the accuracy the the bullet.

Before diving right into the discussion regarding which cartridge has a flatter trajectory, the is command to note that due to the fact that the weight arrays of the bullets of this cartridges carry out not overlap, it is daunting to draw a perfect conclusion.

The complying with table reflects the trajectory and the energies retained by the typical medium-weight bullets in the two categories-

CartridgeMuzzle Velocity & EnergyTrajectories and also Energies
100 yards200 yards300 yards400 yards500 yards
300 Rum

180 gr

3250 fps

4222 ft-lb


3,722 ft-lb


3,274 ft-lb


2872 ft-lb


2510 ft-lb


2185 ft-lb

338 Lapua

270 gr

2800 fps

4700 ft-lb


4303 ft-lb


3943 ft-lb


3591 ft-lb


3271 ft-lb


2973 ft-lb

From the table above, we have the right to see the for medium-weight bullets – as per the respective varieties in both the cases, the of Rum has a flatter trajectory, which have the right to be attributed to the greater muzzle velocity.


Though the impact of recoil varies from user to user the is a well-settled reality that a heavy recoil is not desired as it no only causes fatigue come the prepper but additionally hampers the accuracy.

There isn’t a stark distinction in the recoil of the two cartridges, as they space both offered for permanent hunting.

Yet, .300 RUM has slightly lesser recoil as result of its fairly lighter bullets with reduced energy, which provides the user one extra second for sight acquisition. In .338 Lapua, a high recoil is expected, and the prepper might feel a spicy backward “kick” as result of its hefty bullet v high energy.

A great recoil pad with a well-designed share can assist to mitigate the recoil to part extent. Further, a muzzle brake, i m sorry is associated to the barrel or muzzle the the firearm to respond to the recoil is additionally a an excellent option.



Since both cartridges space for long-range shooting, your accuracy holds much significance. The accuracy largely depends ~ above the velocity, recoil, trajectory, and propellant in the case.

The accuracy of the .300 RUM bullet is quite high in the range of 700-1000 meters, primarily as result of its higher muzzle velocity and also flatter trajectory. Further, its relatively lower recoil avoids inconsistency ~ each cartridge which consequently increases the accuracy. However, in extreme weather conditions, the bullet may be based on some deflection also in medium ranges.

In lengthy ranges, .338 Lapua performs better. It deserve to cover a distance of approx 1500 meter with an excellent accuracy and precision. Despite a heavy recoil, its hefty bullet incurring minimal wind deflection coupled v the truth that it maintain its energy far better maintains the consistency even in excessive weather conditions. Also, the bullet’s big diameter gives the user some room for error in terms of accuracy.

Concentricity is additionally a significant factor to look top top while make the efforts to accomplish the wanted target. It is the straightness that the cartridge along its central axis. For higher concentricity, that is important to ensure that the case wall surface and the situation neck perfectly align v the center.

The deviation the the bullet have the right to be measured by a tool called “concentricity gauge”. A greater deviation shows a lower concentricity and also vice-versa.

Ammunition Options


Both the cartridges have good popularity in the ammunition industry and have several options available.

Almost all big ammunition companies, consisting of the Barnes, Hornady, HSM, Norma, and Swift, develop .300 RUM cartridges v varying strength levels accessible in full, medium, and the decreased loads. The decreased ones deserve to be substituted with the complete loads while going for medium-range searching to avoid hefty recoil. The reloading components of the cartridge are conveniently available, which renders it an ext popular among the reloaders.

Further, the bullet’s dimension of .300 RUM is similar to .308 Winchester, 30-06 Springfield, and 300 PRC, which gives the reloader access to a wide range of quality rounds because that achieving different purposes.

.338 Lapua is also produced by over a dozen service providers in lot of configurations and is used in practically 30 countries. Further, that bullet size is similar to 338 Federal, 340 Weatherby Magnum, and also .338-378 Weatherby Magnum that opens a wide range of selections in the hands of a prepper.


The price that the cartridge additionally plays a far-reaching role if making a selection between the two.

Though both cartridges loss in the “expensive” domain, Remington 300 has an leaf on 338 Lapua in terms of cost. The lower and also average-quality ring of Lapua expense 4.22 and 6.50, respectively, vice versa, those of RUM price 3.46 and also 5.30, respectively.

Which come Pick?


While both the cartridges space phenomenal, their performance and certain specifications make them an ext suitable over one more in one arena or other.

The RUM has a greater velocity and also a flatter trajectory 보다 the Lapua. It renders it a better choice because that shooting competitions, both short-range and also long-range. It is also terrific choice for hunting (except for incredibly long ranges) as it can provide traumatizing wounds vis-a-vis a lesser recoil.

Coming to the Lapua, it is a wonderful choice for excessive long-range searching (if one is comfortable with its recoil) due to its hefty bullet with greater energy. That is bullets penetrate more (about 2-3 inches) and expand rapidly, leading to heavier damage. It provides it an edge on the RUM in searching down bigger animals. However, due to its greater recoil, the is generally not preferred for searching swift animals.

See more: Jennifer Wilder Morgan'S ' Come To The Garden - On Stage!

Lastly, if you are a regular hunter searching smaller animals within simple ranges, then you can go for the RUM as it is fairly cheaper.