The 300 RUM or Remington Ultra Magnum is a high-powered rifle cartridge introduced in 1999 by Remington Arms Company for long-range shooting and big game hunting. This cartridge was designed based on the .404 Jeffery case but with a slightly shorter overall length to fit standard-length actions. The 300 RUM ammo typically fires a .30 caliber bullet at velocities approaching 3,000 ft/s, making it one of the fastest and most powerful rounds available for bolt-action firearms. It is a widely famous load among hunters and long-range shooters who demand maximum performance and accuracy at long distances.

We sell some of the best 300 RUM ammo in terms of quality and performance from top ammunition manufacturers worldwide. Our sake services are reliable, flexible, fast, and low-cost. You can place your order today at (name of the website) to experience the power of this cartridge at your next shootout. Buy now and have fun!


300 RUM ammo is well known for use in big game hunting at long-range shooting thanks to its extremely high velocities and power. It effectively takes down bug animals like moose, elk, and bears at long distances. It is also a popular cartridge among competitive precision shooters who engage at long distances. The 300 RUM is a reliable round to produce high performance from rifles thanks to its accuracy and flat trajectory.


  1. Case type; Rebated rim, bottleneck
  2. Parent case; .404 Jeffery
  3. Case length; 2.850 in (72.4 mm)
  4. Case capacity; 7.14 cm3
  5. Overall length; 3.600 in (91.4 mm)
  6. Bullet diameter; .308 in (7.8 mm)
  7. Neck diameter; .344 in (8.7 mm)
  8. Shoulder diameter; .525 in (13.3 mm)
  9. Base diameter; .550 in (14.0 mm)
  10. Rim diameter; .534 in (13.6 mm)
  11. Rifling twist; 1 – 10
  12. Primer type; Large rifle magnum
  13. Max pressure; 65,000 psi


The 300 RUM ammo typically fires a bullet with a weight between 150 and 220 grains at velocities ranging from 3,000 to 3500 ft/s, resulting in an energy of 3,900 to 4,500 ft-lbf.

The Three Hundred RUM ammo can generally shoot accurately at 1000 yards and above.


The best grain of this bullet type will depend on the shooter’s intended use and personal preference. Some popular Three Hundred RUM ammo choices are:

  1. Barnes TTSX: Due to its accuracy and high weight retention, this load is ideal for hunting where power and deep penetration are needed;
  2. Berger VLD:  For long-range shooting, this load is what you need as it has a high ballistic coefficient and long-range accuracy
  3. Nosler AccuBond: This is another excellent bullet for hunting. It has a polymer tip that helps with accuracy and expansion on target;
  4. Hornady ELD-X With its polymer tip that helps with accuracy and expansion on impact, this round is great for hunting.


  1. Tactical applications: Some military and law enforcement agencies use this load for long-range snipping and tactical operations;
  2. Hunting: The Three Hundred RUM is a famous cartridge for hunting large game animals like moose and elk thanks to its high velocity and energy;
  3. Personal Defense: While not as popular as other cartridges for personal defense, the high energy and accuracy of the RUM ammo make it a suitable self-defense load in a variety of situations;
  4. Recreational shooting: The versatility of this ammunition makes it a fun round for recreational shooting;
  5. Long-range shooting: This load’s accuracy and high velocity make it an excellent choice for target and long-range competition shooting.


  1. High velocity: The high-velocity level of the 300 RUM ammo makes it a great choice for long-range shooting;
  2. High energy: Energy delivered by the three hundred RUM is very high on impact, which is necessary for taking down big games;
  3. Availability: While not as common as some other loads, .300 RUM ammo is easily available online at our store;
  4. Versatility: A wide variety of bullet types and weights can be loaded by the .300 RUM. Because of this, this round is good for target shooting and hunting;
  5. Accuracy: The .300 RUM has excellent accuracy when shooting at long distances.

300 RUM VS 300 WIN MAG

These ammunitions are both power .30 bullet diameter cartridges but do have some differences, such as:

  1. Cartridge size and capacity: the 300 WIN has a standard-length cartridge, while the 300 RUM uses a longer magnum cartridge. This allows the Three hundred RUM to hold more power and generate higher velocities and energy levels than the 300 WIN. As a result, the Three hundred RUM is generally considered a more powerful and long-range cartridge than the 300 WIN, although it generates more recoil and has a shorter barrel life.


The .300 Remington Ultra Mag (RUM) is a high-powered rifle cartridge developed by Remington Arms in 1999. It was designed to offer long-range accuracy and power for big-game hunting and target shooting. The .300 RUM is based on the shortening and necking down of the version of the .404 Jeffery case. It has a larger case capacity than other popular .30 caliber cartridges like the .300 Winchester Magnum and .308 Norma Magnum. This extra capacity of this round allows higher velocities and greater energy transfer, which makes it a renowned ammo for hunters and long-range shooters.

Since its development, the 300 RUM ammo has gained a reputation for being a flat-shooting and hard-hitting round for several shooting conditions, like big game hunting and long-range competition shooting.


If you need powerful and versatile ammo suitable for a variety of shooting applications ranging from large game hunting, competition shooting at long ranges, or tactical operations, the 300 Remington Ultra Mag (RUM) ammo for sale at our online store is the perfect bullet for your needs. Thanks to its high velocity and accuracy, this load has maintained its place in the hand of shooters and hunters. Also, the ability to load different bullet types and weights of this ammunition enables fun and challenging recreational shooting experiences. Place your order today with us (insert name of the site) of this exceptional, reliable, and effective ammunition for a fun filled game!


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