Reliable 308 Winchester load data can be found directly from major powder manufacturers and bullet makers, including Hodgdon, Alliant, Vihtavuori, Sierra, Speer, Lyman, and Hornady. Published load data normally includes the tested bullet weight, bullet profile, powder type, starting powder charge, maximum powder charge, expected muzzle velocity, and measured chamber pressure. The most common bullet weights represented in published .308 Winchester reloading data range from lightweight 110 grain target projectiles up to heavy 190 grain match bullets. Powder manufacturers publish this data specifically for the standard .308 Winchester chamber, and using these precise component combinations is critical because load data can vary significantly between sources due to differences in brass capacity, primer selection, and test barrel tolerances.
308 Winchester Load Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity (Max) | Pressure (Max) | Test Barrel / Firearm | Source |
| Barnes TSX | 150 gr | Winchester 748 | 44.0 gr | 48.5 gr | 2,860 fps | 59,500 PSI | 24″ Barrel | Hodgdon Data |
| Nosler Partition | 150 gr | IMR 4064 | 43.0 gr | 47.7 gr | 2,900 fps | 57,000 PSI | 24″ Barrel | Hodgdon / IMR |
| Hornady SST | 150 gr | Hodgdon Varget | 44.0 gr | 47.0 gr | 2,937 fps | 50,300 CUP | 24″ Barrel | Hodgdon Data |
| Sierra MatchKing | 168 gr | Hodgdon Varget | 42.0 gr | 46.0 gr | 2,758 fps | 50,600 CUP | 24″ Barrel | Hodgdon / Sierra |
| Sierra MatchKing | 168 gr | IMR 4064 | 41.5 gr | 45.9 gr | 2,766 fps | 58,800 PSI | 24″ Barrel | Hodgdon / IMR |
| Nosler AccuBond | 165 gr | Alliant Reloder 15 | 42.0 gr | 46.2 gr | 2,780 fps | Not published | 24″ Barrel | Alliant Data |
| Sierra MatchKing | 175 gr | Hodgdon Varget | 42.0 gr | 45.0 gr | 2,690 fps | 50,000 CUP | 24″ Barrel | Hodgdon Data |
| Sierra MatchKing | 175 gr | IMR 4064 | 41.5 gr | 45.6 gr | 2,700 fps | 59,000 PSI | 24″ Barrel | Hodgdon / IMR |
Understanding The .308 Winchester Load Data
Reloading manuals provide data that has been strictly pressure tested in controlled laboratory environments using specialized universal receivers.
- Starting load: The safest baseline powder charge recommended by the publisher. It generates enough pressure for consistent ignition while maintaining a wide margin of safety during your initial load development.
- Maximum published load:The highest powder charge tested that remains within the SAAMI pressure limit for the .308 Winchester, which is set at 62,000 PSI or 52,000 CUP.
- Velocity: The expected speed of the projectile as recorded by laboratory chronographs during testing.
- Pressure: The internal chamber pressure measured in PSI (Pounds per Square Inch) or CUP (Copper Units of Pressure).
- Bullet weight: The physical mass of the projectile in grains.
- Powder: The specific brand and burn rate of the propellant used.
- Barrel length: The length of the test barrel used by the laboratory. Standard test barrels for the .308 Winchester are commonly 24 inches to ensure a complete powder burn.
- Test conditions: Laboratories use specifically sized testing equipment, specific brass cases, and specific Large Rifle primers to gather their data.
Reputable sources publish varying numerical figures because they utilize different brass brands, distinct primer batches, and testing barrels with slightly different internal tolerances.
.308 Winchester Bullet Weight Load Data
The .308 Winchester is one of the most versatile centerfire cartridges in existence, utilized for military applications, precision rifle competitions, and big game hunting.
- 110 grain to 125 grain: Typically used for varmint hunting or low recoil target loads. These lightweight bullets achieve high velocities, frequently exceeding 3,000 fps, but shed energy quickly at longer distances.
- 150 grain: The absolute classic bullet weight for hunting medium game like whitetail deer. Published .308 Winchester load data for 150 grain bullets is abundant, with maximum velocities routinely hitting 2,800 to 2,900 fps.
- 165 grain to 168 grain:Widely considered the sweet spot for both hunting and precision target shooting.The 168 grain Sierra MatchKing has been the gold standard for police sniper loads and competition shooting for decades.
- 175 grain: The modern standard for long range precision shooting, originally popularized by the military M118LR load. The 175 grain bullets stabilize perfectly in standard 1 in 10 or 1 in 12 twist barrels and remain supersonic past 1,000 yards.
- 180 grain to 190 grain: The heaviest practical weights supported by standard .308 Winchester reloading data. These projectiles are favored for deep penetration on elk and moose, with velocities commonly ranging from 2,450 to 2,600 fps.
.308 Winchester Powder Load Data
Because of its highly efficient case design and moderate capacity, the .308 Winchester performs exceptionally well with medium burning rifle powders.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon Varget | Sierra MatchKing | 168 gr | 42.0 gr | 46.0 gr | 2,758 fps | Hodgdon |
| IMR 4064 | Sierra MatchKing | 168 gr | 41.5 gr | 45.9 gr | 2,766 fps | Hodgdon |
| Winchester 748 | Hornady SST | 150 gr | 44.0 gr | 48.5 gr | 2,860 fps | Hodgdon |
| Alliant Reloder 15 | Nosler AccuBond | 165 gr | 42.0 gr | 46.2 gr | 2,780 fps | Alliant |
Load data published for a specific 168 grain bullet profile cannot automatically be used for a different 168 grain bullet. Bearing surface differences create distinct friction levels inside the barrel.
.308 Winchester Bullet And Powder Combinations
The exact component combination dictates the internal pressure of the cartridge. The .308 Winchester is famously forgiving to reload, but requires attention to case capacity.
Bullet construction matters heavily. A solid copper monolithic bullet, like the Barnes TSX, is longer than a lead core bullet of the exact same weight. This increased length means the monolithic bullet seats deeper into the brass case, which intrudes on the powder column, reduces internal case capacity, and raises pressure.
Furthermore, brass selection plays a major role in .308 Winchester load development. Thicker military brass, such as Lake City cases, or premium Lapua brass, has a smaller internal volume than standard commercial Winchester brass. A maximum powder charge developed in a thin walled case will generate dangerous overpressure if dumped into a thick walled military case. Reloaders must match the published load data to the exact tested components and reduce their powder charge by at least 1 to 2 grains if using military brass.
.308 Winchester Velocity From Published Data
Velocities provided in published manuals serve as a laboratory baseline rather than a universal guarantee.
- Manufacturer published velocity:Generated in heavily controlled test environments using precise universal receivers with 24 inch barrels.
- Independent chronograph testing: Measured by reloaders using production rifles. It is common for a load rated at 2,750 fps in a manual to yield slightly lower numbers out of a standard hunting rifle due to bore wear or a looser chamber tolerance.
- Ballistic calculator estimates: Software predictions based on bullet weight, powder charge, and barrel length. These are strictly mathematical estimates and do not replace physical chronograph data.
Do not present a software calculated velocity as a verified or measured velocity.
.308 Winchester Load Data By Barrel Length
Barrel characteristics radically affect .308 Winchester velocity, though the efficient cartridge suffers less velocity loss in short barrels than magnum calibers.
- 24 inch barrels: The standard length used in laboratory testing and traditional target rifles. These barrels extract the maximum possible velocity and ensure a full powder burn.
- 20 inch barrels: A very common length found on tactical rifles and modern hunting platforms. Shooters utilizing a 20 inch barrel will experience a moderate velocity loss, often dropping 60 to 100 fps compared to 24 inch laboratory figures.
- 16 inch barrels: Found on compact carbines and AR 10 platforms. A 16 inch barrel will yield significantly lower velocities, sometimes dropping a 2,700 fps load down to 2,500 fps, accompanied by a louder muzzle blast.
Always identify the test barrel length associated with any published velocity figure.
.308 Winchester Energy And Ballistics
When loaded to its potential, the .308 Winchester delivers exceptional kinetic energy and a predictable trajectory that has made it a favorite among military snipers and hunters alike.
Using published Hodgdon data for a 168 grain bullet leaving a 24 inch barrel at 2,750 fps, the cartridge produces roughly 2,820 foot pounds of muzzle energy. A 150 grain bullet launched at 2,900 fps will generate around 2,800 foot pounds of muzzle energy. Due to the high ballistic coefficients of modern .30 caliber bullets, the projectile retains energy exceptionally well, making it a premier cartridge for taking large game at typical hunting distances out to 400 yards. Clearly identify the exact bullet and load associated with every ballistic figure.
Standard .308 Winchester vs 7.62x51mm NATO Data
It is vital to understand the difference between commercial .308 Winchester and military 7.62x51mm NATO data.
- .308 Winchester load data:Commercial .308 Winchester is rated by SAAMI for a maximum pressure limit of 62,000 PSI. Published .308 Winchester load data operates up to this limit to maximize velocity.
- 7.62x51mm NATO data: The military version of the cartridge operates at a lower pressure, typically around 50,000 PSI.
- Safety warning: While it is generally safe to fire 7.62 NATO ammunition in a modern .308 Winchester rifle, you should never fire full power commercial .308 Winchester ammunition in vintage military rifles chambered specifically for 7.62 NATO, as the older actions may not be built to withstand the higher 62,000 PSI limit. Always verify your specific rifle’s chambering and pressure rating.
Manufacturer Data vs Independent Testing
When researching .308 Winchester reloading data, you must prioritize official manufacturer data over user submitted load reports.
Manufacturer data is rigorously pressure tested using advanced piezoelectric transducers to measure exactly what is happening inside the chamber. Independent testing done by consumers generally only measures velocity via a chronograph. A chronograph cannot detect a dangerous pressure spike. An independent tester might achieve extreme velocities and claim a load recipe is safe simply because their specific rifle did not blow up, but that does not make it a verified or safe standard.
.308 Winchester Pressure And Safety
The .308 Winchester requires explicit attention to detail during the reloading process, particularly regarding case capacity and headspace.
Because the cartridge is chambered in bolt action rifles, lever actions, pump actions, and semi automatic AR 10 platforms, reloaders must size their brass appropriately. Semi automatic rifles require full length resizing to ensure reliable chambering and extraction, while bolt action shooters can often get away with neck sizing only. Furthermore, reloaders must always begin their .308 Winchester load development at the published starting load and work up carefully in small increments, watching for heavy bolt lift or flattened primers.
Best Sources For .308 Winchester Load Data
The most reliable sources for verified reloading data include:
- Hodgdon Reloading Data Center:Excellent for online, pressure tested data covering a massive variety of Hodgdon, IMR, and Winchester powders like Varget and IMR 4064.
- Sierra Manual: Offers extremely thorough data sets across multiple powders for their exceptionally accurate MatchKing and GameKing projectiles.
- Nosler Reloading Guide: The best source if you are loading their premium hunting bullets like the AccuBond or Partition, offering highly detailed velocity charts.
- Hornady Handbook: Provides explicitly tested standard pressure data for their ELD Match, ELD-X, and traditional Soft Point bullets.
Common .308 Winchester Load Data Questions
Where can I find .308 Winchester load data?
Authoritative data is available in the Sierra Manual, the Nosler Reloading Guide, and the online Hodgdon Reloading Data Center.
What powders are used in published .308 Winchester data?
Medium burning rifle powders are standard, including Hodgdon Varget, IMR 4064, Winchester 748, Alliant Reloder 15, and Hodgdon CFE 223.
What bullet weights have .308 Winchester load data?
Published data exists primarily for 110, 125, 150, 165, 168, 175, 180, and 190 grain bullets.
What is the best source for .308 Winchester reloading data?
The physical manuals from Sierra and Nosler, along with the Hodgdon Reloading Data Center, are the most verified and comprehensive sources.
Why does .308 Winchester load data vary between sources?
Laboratories use different test barrel lengths, varying brass capacities, distinct primer types, and distinct bullet bearing surfaces.
What is the difference between .308 Winchester and 7.62 NATO load data?
The commercial .308 Winchester operates at a higher maximum SAAMI limit of 62,000 PSI, while the 7.62 NATO operates at lower pressures.
Does barrel length affect .308 Winchester velocity?
Yes. A 24 inch test barrel will yield significantly higher velocities and a more complete powder burn than a 16 inch or 20 inch tactical barrel.
Can the same powder charge be used with a different bullet?
No. Different bullets of the exact same weight have different lengths and seating depths, requiring specific standard pressure load data.
What is the difference between starting and maximum published load data?
The starting load is a safe baseline for load development, while the maximum load is the absolute highest charge tested that remains within the safe 62,000 PSI pressure limit.
Does Hodgdon publish .308 Winchester load data?
Yes, the online Hodgdon Reloading Data Center provides extensive pressure tested data utilizing Varget, IMR 4064, and other medium burning powders.
Does Hornady publish .308 Winchester load data?
Yes, Hornady includes this cartridge in their current reloading handbooks, providing exact data for their SST, InterLock, and ELD Match bullet lines.
Does Nosler publish .308 Winchester load data?
Yes, Nosler provides extensive load data for the .308 Winchester in their manual and online data center, heavily featuring the 150 grain and 165 grain AccuBond.
Does Lyman publish .308 Winchester load data?
Yes, the Lyman reloading manual includes comprehensive data sets for the cartridge across various bullet and powder brands, including cast lead data.
Final Verdict
For accurate and safe .308 Winchester load data, reloaders must pull recipes directly from authoritative sources like Sierra, Hodgdon, Nosler, and Hornady. It is imperative to compare the exact bullet profile, powder type, and component list before beginning your load development. Because the .308 Winchester case capacity can vary drastically between commercial and military brass, reloaders must explicitly avoid swapping brass brands without reducing powder charges to ensure safe pressures. By utilizing verified, laboratory tested load data, reloaders can safely maximize the legendary accuracy and proven downrange performance of the .308 Winchester.