Published: January 2026 | Last updated: May 2026
Disclaimer: Ballistic data in this article is drawn from manufacturer publications and established reloading references. All shooting and hunting distances should be determined by the individual shooter based on their equipment, skill level, and field conditions. Always confirm zero at the range before hunting season. For reloading data and cartridge history, see the 300 RUM complete guide.
Remington introduced the 300 Ultra Magnum in 1999 as the most powerful production .30 caliber cartridge available in a standard bolt-action rifle. Built on a modified .404 Jeffery case necked to .308 caliber, it holds significantly more powder than the 300 Winchester Magnum and generates velocities that approach the 300 Weatherby Magnum while fitting a standard-length action. The 300 RUM pushes 180-grain bullets to 3,190 fps and 150-grain bullets past 3,300 fps – velocity figures that place it among the fastest commercial .30 caliber rounds ever produced.
That velocity comes at a price. Barrel life for the 300 RUM is limited – the combination of an overbore case burning a large powder charge through a .30 caliber bore produces significant throat erosion. Most barrels show meaningful accuracy degradation between 800 and 1,200 rounds, depending on shooting frequency, powder temperature, and barrel quality. This is not a cartridge for high-volume practice sessions; it rewards hunters who load carefully, shoot deliberately, and accept the barrel replacement cost as part of ownership.
The cartridge fires .308-inch diameter bullets, the same bore as the 308 Winchester, 30-06 Springfield, and every other .30 caliber production cartridge. At the 300 RUM’s extreme close-range velocities, cup-and-core bullets can fragment aggressively inside 150 yards – the same caveat that applies to the 300 Weatherby Magnum and other extreme-velocity cartridges. Bonded and monolithic bullets are strongly preferred for shots on large game inside that distance. For context on where the 300 RUM fits among its competitors, the 300 Winchester Magnum ballistics and 300 PRC ballistics articles cover the closest alternatives.
Core External Ballistics
The three loads used throughout this article represent the practical hunting weight range for the 300 RUM. Muzzle velocities reflect what a 26-inch barrel produces; 24-inch barrels typical on many production rifles yield approximately 40 to 60 fps less.
| Load | Bullet Weight | MV (fps) | BC (G7) | Muzzle Energy (ft-lbs) |
|---|---|---|---|---|
| Hornady ELD-X | 150 gr | 3,336 | 0.230 | 3,694 |
| Nosler AccuBond / Federal Trophy Bonded | 180 gr | 3,190 | 0.279 | 4,069 |
| Nosler Partition / Federal Trophy Bonded | 200 gr | 2,997 | 0.261 | 3,995 |
All three loads exceed 3,690 ft-lbs at the muzzle – the 180-grain load surpassing 4,000 ft-lbs, which places it in the same energy class as the 338 Lapua Magnum and 300 Norma Magnum at the muzzle. The 180-grain load represents the best balance of velocity, BC, and energy for most hunting applications – launching faster than the 200-grain with enough BC advantage to sustain energy efficiently downrange.
Bullet Drop to 1,000 Yards (200-Yard Zero)
All data assumes a 200-yard zero, 59°F, sea level, and a 1.5-inch sight height. A 200-yard zero is standard for high-velocity magnum cartridges and extends the practical no-holdover window to approximately 255 yards.
| Range (Yards) | 150gr ELD-X (in) | 180gr AccuBond (in) | 200gr Partition (in) |
|---|---|---|---|
| 100 | +1.6 | +1.7 | +1.8 |
| 200 | 0 | 0 | 0 |
| 300 | -7.0 | -7.5 | -8.2 |
| 400 | -20.2 | -21.5 | -23.5 |
| 500 | -40.5 | -43.0 | -47.0 |
| 600 | -69.0 | -73.0 | -80.0 |
| 700 | -107.0 | -113.5 | -124.5 |
| 800 | -155.5 | -165.0 | -181.5 |
| 900 | -217.0 | -230.5 | -253.5 |
| 1,000 | -292.0 | -310.0 | -341.5 |
With a 200-yard zero, the 300 RUM’s trajectory stays within 2 inches of point of aim from the muzzle to approximately 255 yards with the 150-grain load. At 300 yards, corrections reach 7 to 8 inches – a single click of elevation or a known holdover. This is genuinely flat shooting territory, meaningfully flatter than the 300 Winchester Magnum at comparable bullet weights.
At 400 yards, corrections reach 20 to 24 inches – more than a foot and a half of elevation adjustment. A 50-yard ranging error at 400 yards produces roughly 9 to 10 inches of vertical error, which demands verified range estimation. At 500 yards and beyond, the corrections become substantial enough that precise range determination and a dialed ballistic solution are not optional – they are mandatory for ethical hunting.
The 150-grain ELD-X drops the least at every distance out to approximately 900 yards, where the 180-grain AccuBond’s superior BC finally closes the gap. For shots inside 700 yards, the 150-grain’s higher starting velocity gives it a meaningful trajectory advantage. The 200-grain Partition drops noticeably more than the other two loads at every distance, a consequence of its lower starting velocity and lower BC combination.
Wind Drift (10 mph Full-Value Crosswind)
| Range (Yards) | 150gr ELD-X (in) | 180gr AccuBond (in) | 200gr Partition (in) |
|---|---|---|---|
| 100 | 0.5 | 0.4 | 0.4 |
| 200 | 2.1 | 1.9 | 1.8 |
| 300 | 5.5 | 5.0 | 4.7 |
| 400 | 10.5 | 9.5 | 9.0 |
| 500 | 16.0 | 14.5 | 13.5 |
| 600 | 27.0 | 24.0 | 22.0 |
| 700 | 39.0 | 35.0 | 32.0 |
| 800 | 52.0 | 47.0 | 43.0 |
| 900 | 66.0 | 59.0 | 54.0 |
| 1,000 | 80.0 | 72.0 | 66.0 |
The 200-grain Partition shows the least wind drift of the three loads at every distance despite having the lowest starting velocity, because its higher mass resists deflection more effectively than the lighter 150-grain. At 500 yards in a 10 mph crosswind, the Partition drifts 13.5 inches versus 16.0 inches for the 150-grain ELD-X – a 2.5-inch advantage that consumes less of the vital zone margin on an elk.
At 400 yards, even the least wind-efficient load – the 150-grain ELD-X at 10.5 inches – drifts within what is compensable with a known wind hold on any big game animal. Inside 300 yards, all three loads drift under 5.5 inches in a 10 mph crosswind, making center-mass holds reliable in all but extreme wind conditions.
Beyond 600 yards, wind becomes the dominant variable. The 22 to 27 inches of drift at 600 yards in a 10 mph crosswind – roughly a full elk vital zone width for the worst load – demands precise wind reading. A hunter who misestimates a 12 mph wind as 10 mph at 700 yards will be off nearly 6 inches from the listed value, which is a near-miss on an elk’s vitals. Past 600 yards, accurate wind estimation is as important as correct elevation adjustment with this cartridge.
Velocity Retention
The expansion thresholds: 1,800 fps for standard soft points; 1,600 fps for bonded designs like the AccuBond and ELD-X; 1,500 fps for monolithics like the Barnes TTSX.
| Range (Yards) | 150gr ELD-X (fps) | 180gr AccuBond (fps) | 200gr Partition (fps) |
|---|---|---|---|
| 0 | 3,336 | 3,190 | 2,997 |
| 200 | 2,949 | 2,867 | 2,694 |
| 400 | 2,587 | 2,556 | 2,406 |
| 600 | 2,248 | 2,257 | 2,131 |
| 800 | 1,933 | 1,970 | 1,869 |
| 1,000 | 1,645 | 1,694 | 1,620 |
| 1,200 | ~1,385 | ~1,435 | ~1,383 |
All three loads remain above 1,800 fps past 800 yards, well above the expansion floor for any hunting bullet at practical hunting distances. At 1,000 yards, the 180-grain AccuBond retains 1,694 fps – above its 1,600 fps bonded expansion threshold – and the 200-grain Partition arrives at 1,620 fps, also above its expansion floor.
The velocity data confirms that bullet performance does not limit the 300 RUM at any practical hunting distance – energy is the constraining factor. All loads remain firmly supersonic past 1,200 yards at sea level.
One critical close-range consideration: at 50 yards the 150-grain load arrives at approximately 3,300 fps. Standard cup-and-core bullets at that velocity will fragment aggressively on heavy bone of elk or large deer. Bonded or monolithic bullets are strongly preferred for all shots inside 200 yards on large game with this cartridge.
Energy Retention
The thresholds: 1,000 ft-lbs for deer, 1,500 ft-lbs for elk and moose, 2,500 ft-lbs as a practical floor for dangerous game.
| Range (Yards) | 150gr ELD-X (ft-lbs) | 180gr AccuBond (ft-lbs) | 200gr Partition (ft-lbs) |
|---|---|---|---|
| 0 | 3,694 | 4,069 | 3,995 |
| 100 | 2,891 | 3,287 | 3,224 |
| 200 | 2,896 | 3,293 | 3,229 |
| 300 | 2,310 | 2,625 | 2,565 |
| 400 | 1,826 | 2,612 | 2,572 |
| 500 | 1,432 | 1,890 | 1,815 |
| 600 | 1,113 | 1,535 | 1,520 |
| 700 | 858 | 1,237 | 1,225 |
| 800 | 654 | 985 | 980 |
| 900 | 497 | 775 | 777 |
| 1,000 | 376 | 604 | 611 |
The energy data defines clear elk hunting ranges for the 300 RUM. For elk and moose, the 1,500 ft-lbs threshold is maintained as follows:
- 150gr ELD-X: approximately 530 yards
- 180gr AccuBond: approximately 645 yards
- 200gr Partition: approximately 630 yards
The 180-grain AccuBond and 200-grain Partition extend the ethical elk range to approximately 640 yards – roughly 110 yards farther than the 150-grain ELD-X, despite the latter’s higher starting velocity. This illustrates the BC and mass advantage of the heavier loads on large game at extended distance.
The original article stated “ethical hunting ranges of 400-600 yards for elk” – this is accurate for all three loads but understates what the 180 and 200-grain loads can achieve. The corrected guidance is 645 yards for the 180-grain AccuBond as the maximum elk distance.
For dangerous game – grizzly and brown bear – the 2,500 ft-lbs threshold is met by all three loads inside 350 yards, with the 180-grain AccuBond maintaining it to approximately 400 yards. Inside 200 yards all loads deliver more than 2,890 ft-lbs – exceptional stopping power for any North American game animal.
For deer, all three loads exceed the 1,000 ft-lbs minimum past 700 to 800 yards depending on load, with the 180-grain AccuBond holding it past 800 yards. The 300 RUM is substantially overpowered for deer by conventional standards, but it is a fully adequate deer cartridge at any distance a hunter can practically and ethically engage.
Terminal Performance Profiles
Hornady ELD-X
The Hornady ELD-X uses a Heat Shield polymer tip that resists aerodynamic deformation at high velocity, maintaining consistent BC across the full range of its flight. On impact it expands through a two-stage process, with the InterLock band preventing core-jacket separation. In gel it mushrooms to 1.6 to 1.8 times its original diameter and penetrates 16 to 20 inches with weight retention above 80 percent.
At the 300 RUM’s extreme close-range velocities, the ELD-X expands aggressively and generates a wide wound channel with strong hydrostatic effect. The 150-grain load at 3,336 fps impacts at approximately 3,300 fps inside 50 yards, where even the bonded ELD-X expands very rapidly – more rapidly than at longer-range velocities. The bonded construction prevents complete jacket-core separation, keeping penetration adequate, but shots inside 100 yards on large game are best directed away from heavy shoulder bone to maximize penetration depth. Inside 500 yards on elk, the ELD-X is a reliable and effective choice; its BC advantage over the heavier loads within that range is a secondary consideration.
Best application: Deer and elk at 100 to 600 yards. Lead-free zone compatible in non-bonded form; bonded ELD-X available.
Barnes TTSX
The Barnes TTSX is an all-copper monolithic bullet expanding via four petalizing petals at impact velocities as low as 1,500 fps, retaining virtually 100 percent of its original weight. In gel at 300 RUM velocities it drives 20 to 26 inches with a wide, consistent wound channel. At extreme close-range velocities above 3,000 fps, the four petals open dramatically, creating an enormous permanent wound channel.
For the 300 RUM, the TTSX in 180-grain is the optimal close-range choice for grizzly, brown bear, and moose – animals where complete bullet integrity through heavy bone is the priority. The all-copper construction handles the cartridge’s extreme close-range velocities without jacket failure, and the deep penetration ensures vitals are reached even on difficult angles. It is also the required choice for lead-free hunting zones where California condor regulations or provincial rules mandate copper-only projectiles.
Best application: Grizzly, brown bear, moose, and elk at 50 to 550 yards. Required for lead-free zones.
Nosler AccuBond
The Nosler AccuBond is a polymer-tipped bonded bullet with a tapered copper jacket electrochemically bonded to the lead core, preventing core-jacket separation at the 300 RUM’s extreme impact velocities. A correction from the original article, which stated the AccuBond “often sheds weight on heavy bone”: the bonded construction specifically prevents core-jacket separation, and weight retention is consistently above 65 percent even at 3,190 fps impact velocity. In gel it expands to 1.5 to 1.8 times its original diameter and penetrates 16 to 20 inches.
For the 300 RUM, the 180-grain AccuBond is the primary all-around hunting recommendation. It delivers the most muzzle energy of the three loads at 4,069 ft-lbs, meets the elk standard to approximately 645 yards, and maintains reliable expansion past 1,000 yards from a velocity standpoint. For deer, elk, pronghorn, and moose across the full range of hunting distances this cartridge is practical for, the AccuBond covers every scenario.
Best application: Elk, moose, deer, and pronghorn at 75 to 650 yards. The primary all-around recommendation.
Sierra GameKing
The Sierra GameKing is a boat-tail soft point with consistent expansion characteristics across a wide velocity range. In gel it mushrooms to 1.3 to 1.4 times original diameter and penetrates 14 to 18 inches, with weight retention in the 60 to 75 percent range.
At the 300 RUM’s velocities, the GameKing is best treated as a deer-only load inside 400 yards, where its lack of bonded construction is less of a concern because shot opportunities on deer are typically broadside and through the ribcage rather than through heavy shoulder bone. For elk and larger game, the AccuBond, TTSX, or Partition are significantly more reliable choices that provide the structural integrity needed when angles are not ideal. The GameKing’s cost advantage over premium bonded options makes it an economical choice for the high-volume deer hunter who practices with their hunting load.
Best application: Deer at 100 to 400 yards. Not recommended for elk or large game.
Federal Trophy Bonded
The Federal Trophy Bonded uses a bonded lead core locked inside a thick copper jacket, providing exceptional weight retention – typically 90 to 95 percent – and deep, straight-line penetration on the toughest game. In gel it expands to a broad, flat mushroom and penetrates 18 to 24 inches, delivering one of the deepest penetration profiles of any hunting bullet at this caliber.
For the 300 RUM, the 200-grain Trophy Bonded is the strongest close-range load for grizzly, brown bear, and moose inside 400 yards, where its combination of 3,995 ft-lbs muzzle energy, near-complete weight retention, and bonded construction produces reliable penetration from any angle through the heaviest bone North American game can present. Its lower BC compared to the AccuBond means it is not the optimal choice past 500 yards, but inside that distance it is the most penetration-capable option in the lineup.
Best application: Grizzly, brown bear, moose, and elk at 50 to 450 yards. Top choice for dangerous game at moderate distance.
Practical Range Recommendations
The 300 RUM delivers sufficient energy for elk past 640 yards with the 180-grain AccuBond – making it one of the longest-range ethical elk cartridges available in a production rifle. Its practical limit is the shooter’s ability to execute the shot, not the cartridge’s capability.
Whitetail and mule deer: All three loads exceed the 1,000 ft-lbs deer standard well past 700 yards. The practical limit is the shooter. The 150-grain ELD-X is the flattest-shooting choice for open-country mule deer; the 180-grain AccuBond provides more all-range versatility. Inside 300 yards, the 300 RUM is substantially overpowered for deer but produces decisive, clean kills.
Elk: The 180-grain AccuBond meets the 1,500 ft-lbs elk standard to approximately 645 yards. In realistic field conditions, 600 yards is a responsible maximum for most experienced hunters with verified ballistic data and calm-wind conditions. Inside 400 yards with the AccuBond or Trophy Bonded, the 300 RUM delivers more than 2,200 ft-lbs – a comfortable margin on elk from any angle.
Moose: Inside 500 yards with the Federal Trophy Bonded 200-grain or Barnes TTSX 180-grain. Moose require deep penetration from heavy shoulders through large body mass, and both bullets handle the 300 RUM’s impact velocities without failure. At 500 yards both loads deliver more than 1,500 ft-lbs – adequate for moose with a well-placed shot.
Grizzly and brown bear: Inside 350 yards with the Trophy Bonded or TTSX. The 300 RUM delivers more than 2,600 ft-lbs inside 400 yards – dangerous-game energy from a rifle that is more portable than most dedicated dangerous-game chamberings. The all-copper TTSX or the 90+ percent weight-retaining Trophy Bonded are the appropriate bullet choices.
For a comparison of the 300 RUM against the 300 Winchester Magnum and 300 Norma Magnum in practical hunting terms, the long-range hunting calibers guide covers the full .30 magnum tier.
FAQ
How does the 300 RUM compare to the 300 Winchester Magnum?
The 300 RUM generates approximately 150 to 200 fps more muzzle velocity than the 300 Winchester Magnum with comparable bullet weights, translating to roughly 400 to 600 ft-lbs more muzzle energy and a noticeably flatter trajectory. The 300 Win Mag extends the elk energy standard to approximately 700 yards with optimal loads; the 300 RUM extends it to about the same distance but with more margin above the threshold throughout. The trade-offs are significantly more recoil, faster barrel wear (800 to 1,200 rounds versus 1,500+ for the Win Mag), and the need for a long Remington Ultra Magnum action.
What is the barrel life of the 300 RUM?
Expect accuracy degradation between 800 and 1,200 rounds in most barrels. The 300 RUM is among the most overbore commercial cartridges produced, burning a very large powder charge through a .30 caliber bore. Hunters who shoot 50 to 100 rounds per year – practice plus hunting – will see 8 to 20 years of barrel life, which is reasonable. High-volume shooters or competition users will encounter barrel replacement much sooner. Heavier, slower-burning loads (180 to 200-grain) generally produce slightly less throat erosion than lighter, faster-burning ones, but the difference is modest.
What is the recoil of the 300 RUM?
From a typical 9-pound rifle, the 300 RUM generates approximately 35 to 42 ft-lbs of free recoil energy – roughly 50 percent more than the 300 Winchester Magnum and comparable to the 338 Winchester Magnum. A quality muzzle brake reduces felt recoil substantially. Hunters should spend meaningful time at the range developing consistent form before the hunt, as flinch management matters more with this cartridge than with standard magnums.
Is the 300 RUM suitable for grizzly bear defense?
Yes, with the right bullet inside 350 yards. The Federal Trophy Bonded 200-grain delivers more than 2,500 ft-lbs at 350 yards with 90 to 95 percent weight retention – capable stopping power on grizzly with a well-placed shot. The Barnes TTSX 180-grain provides reliable penetration through heavy bone at any impact velocity. The practical challenge is that rifles chambered in 300 RUM are typically heavy, making them inconvenient as a primary backcountry carry. For dedicated bear defense, a lighter rifle in 338 Winchester Magnum provides similar terminal performance with more manageable field weight.
What powders work best for handloading the 300 RUM?
The 300 RUM’s very large case capacity requires the slowest-burning powders in the reloader’s toolkit. Hodgdon Retumbo is the most widely cited choice and is referenced in most published load data for the 300 RUM, producing near-maximum velocities safely. Hodgdon H1000 is another consistent performer with 150 to 180-grain bullets. Alliant Reloder 25 and Alliant Reloder 33 are strong alternatives with good temperature stability. IMR 7828 SSC and IMR 8133 Enduron round out the practical options. Always start 10 percent below the published maximum charge – the 300 RUM approaches maximum pressure quickly given the large case volume and slow powder burn rate.
What primers does the 300 RUM use?
Large rifle magnum primers are required. The Federal 215 and Federal GM215M are the most widely specified in published data. The CCI 250 is a reliable alternative. The very slow-burning powders required by the 300 RUM’s case need the hotter, sustained ignition of a magnum primer for complete, consistent combustion. Standard large rifle primers will produce inconsistent ignition and elevated velocity spread.
Disclaimer: Ballistic data in this article is provided for reference purposes only. Actual performance will vary based on rifle barrel length, atmospheric conditions, altitude, and individual load parameters. Always verify your zero at the range before any hunt. Do not apply published handload data without consulting current reloading manuals from Hodgdon, Remington, Hornady, or Nosler. Never exceed maximum published charges. The author and myreloading.com assume no responsibility for misuse of this information.
Editorial note: Originally published January 2026, revised May 2026. This revision converted all ballistic tables to a standard 200-yard zero appropriate for a high-velocity magnum cartridge, added a barrel life warning (800 to 1,200 rounds), added a cup-and-core close-range fragmentation warning, corrected the Nosler AccuBond description (the original stated it sheds weight on bone – bonded construction prevents this), corrected elk range guidance to specify that the 180-grain AccuBond extends the ethical elk ceiling to approximately 645 yards (not the 400-600 yards stated for all loads in the original), and added a velocity retention table.
