Reliable 300 PRC reloading data can be found in published manufacturer manuals from Hornady, Barnes, and Sierra. Published load recipes normally include the 0.308-inch bullet design, slow-burning magnum powder type, starting and maximum powder charges, expected muzzle velocity, and cartridge overall length. Common bullet weights covered by published data range from 190-grain hunting projectiles up to massive 250-grain ultra-low-drag match bullets. Results naturally vary between sources due to differences in bullet bearing surface, brass case internal volume, exact powder lot burn rates, test barrel lengths, and atmospheric testing conditions.
300 PRC Reloading Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Pressure (Max) | Primer & Case | Cartridge Overall Length (COL) | Barrel Length / Firearm | Source |
| Barnes LRX BT | 175 grain | Hodgdon H1000 | 75.2 gr | 83.6 gr | 3,135 fps | Not Listed | Fed 215 / Atlas | 3.525″ | 26.00″ / Universal | Barnes |
| Sierra TMK | 195 grain | Hodgdon H1000 | 72.4 gr | 80.8 gr | 3,000 fps | Not Listed | Fed 215 / Hornady | 3.600″ | 24.00″ / Universal | Sierra |
| Barnes LRX BT | 200 grain | Hodgdon Retumbo | 70.0 gr | 77.8 gr | 2,933 fps | Not Listed | Fed 215 / Atlas | 3.500″ | 26.00″ / Universal | Barnes |
| Barnes LRX BT | 208 grain | Hodgdon H1000 | 70.9 gr | 78.8 gr | 2,906 fps | Not Listed | Fed 215 / Atlas | 3.691″ | 26.00″ / Universal | Barnes |
| Barnes LRX BT | 208 grain | Hodgdon Retumbo | 69.9 gr | 77.7 gr | 2,901 fps | Not Listed | Fed 215 / Atlas | 3.691″ | 26.00″ / Universal | Barnes |
| Barnes LRX BT | 208 grain | Alliant RL-26 | 67.3 gr | 74.8 gr | 2,922 fps | Not Listed | Fed 215 / Atlas | 3.691″ | 26.00″ / Universal | Barnes |
| Barnes LRX Bore Rider | 212 grain | Hodgdon H1000 | 73.7 gr | 81.9 gr | 2,965 fps | Not Listed | Fed 215 / Atlas | 3.960″ | 26.00″ / Universal | Barnes |
| Sierra HPBT | 220 grain | Hodgdon H1000 | 72.0 gr | 78.7 gr | 2,800 fps | Not Listed | Fed 215 / Hornady | 3.575″ | 24.00″ / Universal | Sierra |
| Sierra HPBT | 230 grain | Alliant RL-25 | 70.1 gr | 77.9 gr | 2,800 fps | Not Listed | Fed 215 / Hornady | 3.700″ | 24.00″ / Universal | Sierra |
Understanding The 300 PRC Reloading Data
To safely develop a 300 PRC load recipe, handloaders must understand the specific variables that govern this highly efficient, modern magnum cartridge:
- Starting load: The minimum safe powder charge. With the massive powder column of the 300 PRC, dropping below published starting charges with slow-burning magnum powders can cause dangerous hang-fires or inconsistent ignition.
- Maximum published load: The absolute safe powder limit established by a ballistic laboratory. Exceeding this limit will cause dangerous overpressure, leading to blown primers, heavy bolt lift, and potential firearm damage.
- Velocity: The bullet speed in feet per second (fps) measured at the muzzle. The 300 PRC is specifically designed to push heavy 200-grain to 225-grain bullets to instrumental velocities of 2,800 to 2,950 fps.
- Pressure:The 300 Precision Rifle Cartridge is authorized by SAAMI to operate at a maximum average pressure of 65,000 PSI.
- Bullet weight: The mass of the 0.308-inch projectile in grains.
- Powder: The specific propellant type. The cartridge strictly requires very slow-burning magnum rifle powders to maximize performance with heavy bullets.
- Barrel length:Test barrels for the 300 PRC are typically 24 inches to 26 inches with a fast 1:8″ or 1:8.5″ twist rate to stabilize long, high-BC bullets.
- Firearm used for testing: Universal receiver test barrels or high-end production bolt-action rifles.
- Test conditions: Altitude, humidity, and temperature variables during pressure testing.
- Cartridge overall length (COL): The total length of the loaded cartridge. The 300 PRC boasts a modern chamber design and a standard maximum COL of 3.700 inches, allowing long, heavy bullets to be seated without encroaching on the powder column.However, specialized, ultra-long bullets like the 212-grain Barnes LRX Bore Rider may feature a published COL of 3.960 inches, requiring single-loading.
Different published sources may produce varying results because they utilize brass cases with different internal volumes (e.g., Atlas vs. Hornady brass), different primer brands, and varying tight-tolerance test chambers.
300 PRC Bullet Weight Reloading Data
Because the 300 PRC was engineered from the ground up for modern extreme-range shooting, its generous freebore and standard 1:8″ or 1:8.5″ barrel twist rate are designed specifically to stabilize the heaviest, highest ballistic coefficient (BC) 0.308-inch bullets on the market.
- 175 grain to 195 grain:The lighter end of the 300 PRC spectrum, heavily dominated by solid copper monolithic bullets like the 175-grain Barnes LRX or the 195-grain Sierra TMK.Because these bullets are light for the caliber, they are frequently pushed past 3,000 fps, offering incredibly flat trajectories for medium game hunting.
- 200 grain to 212 grain: The flagship weights for hunting. The 200-grain Barnes LRX and the 212-grain Hornady ELD-X are heavily supported by data, offering an incredible balance of flat trajectory and devastating terminal energy. They are typically driven between 2,850 and 2,950 fps.
- 220 grain to 230 grain: Heavy match target weights. The 220-grain and 230-grain Sierra MatchKing, as well as the 225-grain Hornady ELD Match, offer massive BCs, allowing the 300 PRC to buck the wind and retain supersonic speeds well past 1,500 yards.
- 245 grain to 250 grain: The absolute extreme heavyweights, such as the 250-grain Hornady A-Tip or 245-grain Berger Extreme Outer Limits. These ultra-long bullets maximize the 3.700″ COL capacity and are favored by extreme long-range (ELR) competitors.
Do not assume a 200-grain monolithic copper bullet uses the same powder charge as a 200-grain lead-core bullet. Solid copper bullets feature longer bearing surfaces and create more bore friction, which dramatically alters the pressure curve and typically requires reduced powder charges.
300 PRC Powder Reloading Data
The 300 PRC case capacity is optimized for slow-burning, temperature-stable magnum rifle powders.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon H1000 | Barnes LRX BT | 208 grain | 70.9 gr | 78.8 gr | 2,906 fps | Barnes |
| Hodgdon Retumbo | Barnes LRX BT | 200 grain | 70.0 gr | 77.8 gr | 2,933 fps | Barnes |
| Alliant RL-26 | Barnes LRX BT | 190 grain | 69.5 gr | 77.3 gr | 3,067 fps | Barnes |
| Alliant RL-25 | Sierra HPBT | 230 grain | 70.1 gr | 77.9 gr | 2,800 fps | Sierra |
Powders like H1000, Retumbo, and Alliant Reloder 26 are heavily featured in any 300 PRC load data chart.These slow-burning propellants safely fill the case and provide a smooth, extended pressure curve to accelerate heavy bullets without exceeding the 65,000 PSI limit.
300 PRC Bullet And Powder Combinations
The exact component combinations determine the safety and long-range precision of 300 PRC reloading data.
- Brass case capacity:Unlike belted magnums, the 300 PRC headspaces on a 30-degree shoulder. Brand differences are significant; Hornady brass typically holds around 97 grains of H2O, while ADG brass holds closer to 95 grains. A maximum load developed in Hornady brass may cause overpressure if transferred directly into ADG brass without dropping the charge first.
- Primer choice:The 300 PRC ignites large volumes of slow-burning powder, strictly requiring Large Rifle Magnum primers (such as the Federal 215 or CCI 250).
- Seating depth:The 300 PRC was designed with ample freebore to keep long bullets out of the powder column. However, pushing heavy 230-grain bullets deeper into the case than the recommended COL will encroach on the powder column and dangerously spike chamber pressure.
300 PRC Velocity From Published Data
Published 300 PRC velocity figures depend entirely on the barrel length and bullet weight utilized by the laboratory.
| Bullet | Bullet Weight | Powder | Published Load | Muzzle Velocity | Barrel Length | Firearm | Source |
| Barnes LRX BT | 175 grain | H1000 | 83.6 gr (Max) | 3,135 fps | 26.00″ | Universal Receiver | Barnes |
| Sierra TMK | 195 grain | H1000 | 80.8 gr (Max) | 3,000 fps | 24.00″ | Universal Receiver | Sierra |
| Hornady ELD-X | 212 grain | Factory | Factory Load | 2,860 fps | 24.00″ | Universal Receiver | Hornady |
| Hornady ELD-M | 225 grain | Factory | Factory Load | 2,810 fps | 24.00″ | Universal Receiver | Hornady |
It is crucial to distinguish between manufacturer-published velocity (tested in environmentally controlled laboratories with maximum allowed barrel lengths) and independent chronograph testing.
300 PRC Reloading Data By Barrel Length
Barrel length heavily dictates the velocity a reloader will achieve. Major reloading publishers universally utilize 24-inch or 26-inch test barrels to establish their baseline 300 PRC data.
Because the cartridge relies on massive charges of slow-burning powder, it requires a long barrel to achieve a complete, efficient burn. If a handloader fires a 212-grain ELD-X factory load (yielding 2,860 fps from a 24-inch barrel) out of a shorter 20-inch or 22-inch hunting rifle, the velocity will typically drop noticeably. Reloaders must clearly identify their test firearm and barrel length when verifying ballistic drops, as a shorter barrel will significantly alter long-range trajectory and wind holds.
300 PRC Energy And Ballistics
The 300 PRC was meticulously engineered to deliver massive kinetic energy and resist wind deflection at extreme distances. Using verified Hornady factory data equivalents from a 24-inch barrel:
- 212-grain ELD-X (at 2,860 fps):
- Muzzle energy: ~3,850 ft-lbs
- Provides tremendous terminal energy for large game, heavily outperforming lighter .30 caliber magnums at extended ranges.
- 225-grain ELD Match (at 2,810 fps):
- G1 Ballistic Coefficient: .391 G7 (equivalent to roughly .777 G1)
- The incredibly high ballistic coefficients of these heavy .308 bullets allow them to retain energy far more efficiently, remaining supersonic well past 1,500 yards.
Manufacturer Data vs Independent Testing
When researching a 300 PRC load data chart, handloaders will encounter:
- Manufacturer-published reloading data: Officially pressure-tested in a laboratory using piezo-electric sensors to guarantee loads stay safely under the 65,000 PSI limit.
- Independent chronograph testing: Velocities recorded by precision shooters using modern Doppler radar. This verifies speed and extreme spread but cannot measure internal chamber pressure.
- User-submitted load reports: Internet forum recipes that often push past published maximums to chase the 3,000 fps mark with heavy bullets.
Independently measured results frequently differ from published data because consumer rifles feature varying chamber throat tolerances, differing barrel twist rates, and different interior bore friction. Priority must always remain with official, pressure-tested manufacturer data.
300 PRC Pressure And Safety
Safety is paramount when using 300 PRC reloading data. The cartridge operates at a maximum average pressure of 65,000 PSI.
At these high pressures, signs of overpressure can manifest rapidly. Handloaders must vigilantly inspect fired brass for flattened primers, ejector swipe marks on the case head, or stiff bolt lift. Because the 300 PRC utilizes large amounts of very slow powder, changing primer brands or jumping to a brass case with thicker walls (which reduces internal volume) can dramatically spike pressure. Reloaders must drop their powder charges by 10% and work back up anytime a single component is changed.
Furthermore, reloaders must ensure their barrel possesses the correct 1:8″ or 1:8.5″ twist rate. Firing an ultra-heavy 250-grain bullet out of an older 1:10″ twist barrel will result in severe bullet destabilization and poor accuracy.
Best Sources For 300 PRC Reloading Data
The strongest and most authoritative sources for safe 300 PRC load development include:
- Barnes Bullets Load Data:Provides highly detailed, pressure-tested 26-inch barrel data specifically for their solid copper LRX projectiles.
- Sierra Reloading Manual (Sixth Edition):Offers comprehensive data across their MatchKing (HPBT) and Tipped MatchKing (TMK) lines using a 24-inch test barrel.
- Hornady Handbook of Cartridge Reloading: As the creator of the cartridge, Hornady provides the absolute definitive baseline data, highlighting specific seating depths and velocities for their ELD-X and ELD Match projectiles.
Common 300 PRC Reloading Data Questions
Where can I find 300 PRC reloading data?
Authoritative data is published directly by Barnes, Sierra, and Hornady in their respective modern manuals and online PDF data centers.
What powders are used in published 300 PRC data?
Common powders include Hodgdon H1000, Retumbo, Alliant Reloder 25, Reloder 26, and IMR 7828SSC.
What bullet weights have 300 PRC reloading data?
Published data covers 175-grain and 190-grain monolithic hunting projectiles up to heavy 230-grain and 250-grain ultra-low-drag match bullets.
What is the best source for 300 PRC reloading data?
Hornady is the original developer of the 300 PRC and provides the most comprehensive baseline data, while Barnes and Sierra offer excellent pressure-tested alternatives for their specific projectiles.
Why does 300 PRC reloading data vary between sources?
Variations occur due to differences in bullet profile, solid copper versus lead-core bearing surfaces, differing laboratory chamber throat tolerances, and varying lots of magnum powder.
Does barrel length affect 300 PRC velocity?
Yes. A 26-inch laboratory test barrel will consistently yield higher velocities than a 22-inch or 24-inch hunting barrel using the exact same load.
Can the same powder charge be used with a different bullet?
No. Different bullet profiles, materials, and bearing surfaces alter internal case capacity and friction, which dramatically changes chamber pressures.
What is the difference between starting and maximum published load data?
The starting load is the safe baseline for working up a new recipe. The maximum load is the absolute highest pressure limit established safely by a ballistic laboratory.
Where can I find pressure-tested 300 PRC data?
Pressure-tested data is available directly from major bullet and powder manufacturers, including Hornady, Barnes, and Sierra.
Does Hodgdon publish 300 PRC reloading data?
Hodgdon features data specifically for their Extreme line of powders like H1000 and Retumbo, which are frequently cited in manuals by Sierra and Barnes for this cartridge.
Does Hornady publish 300 PRC reloading data?
Yes. Hornady created the 300 PRC and publishes comprehensive load recipes tailored specifically for their heavy 0.308-inch projectiles.
Does Nosler publish 300 PRC reloading data?
Nosler publishes limited data for their AccuBond bullets in the caliber, but comprehensive data is best sourced from Hornady, Barnes, or Sierra.