450 Bushmaster vs. .308 Winchester: Big-Bore and Full-Power Hunting Cartridges Compared
The 450 Bushmaster vs. 308 Winchester comparison comes down to two very different approaches to hunting.
The .308 Winchester is a mature, versatile bottleneck cartridge with a huge ammunition ecosystem, strong ballistic efficiency, excellent bullet selection, and a proven reputation for hunting and target shooting. The .450 Bushmaster takes the opposite approach: a large-diameter, straight-wall projectile launched from a compact AR-15-compatible platform for practical hunting distances.
Neither cartridge is automatically better.
The .308 Winchester is generally the better choice when range, trajectory, wind resistance, ammunition availability, and versatility matter most. The .450 Bushmaster becomes particularly attractive where straight-wall cartridge regulations apply and when a hunter wants a large-bore cartridge in a compact platform.
450 Bushmaster vs. .308: Quick Answer
For long-range performance, the .308 Winchester wins decisively. Its more aerodynamic bullets retain velocity and energy better, produce less drop and wind drift, and give shooters a much larger selection of hunting and target ammunition.
The .450 Bushmaster has a different advantage. Its straight-wall design can satisfy regulations that restrict deer hunters to qualifying straight-wall centerfire cartridges, while its large .452-inch projectile delivers substantial close- and medium-range performance.
That makes the decision less about which cartridge produces the larger number on a ballistic chart and more about where you hunt, what your regulations permit, what platform you prefer, and how far you expect to shoot.
.450 Bushmaster vs. .308 Winchester Specs
| Specification | .450 Bushmaster | .308 Winchester |
|---|---|---|
| Cartridge type | Straight-wall centerfire | Bottleneck centerfire |
| Bullet diameter | .452 in. | .308 in. |
| Typical hunting bullet weight | Approximately 200–300 gr | Approximately 150–180 gr |
| Common platforms | AR-15, bolt action, single shot | Bolt action, AR-10/SR-25 pattern, other rifles |
| Typical hunting role | Deer and other suitable medium/large game at shorter ranges | Deer, elk and other suitable game depending on load and regulations |
| Strength | Large projectile and compact-platform compatibility | Range, trajectory and versatility |
The two cartridges are built around very different design priorities.
The .308 uses a bottleneck case and relatively narrow, aerodynamic bullets. The .450 Bushmaster uses a straight-wall case and a much larger projectile.
.450 Bushmaster Bullet vs. .308 Bullet
The visual difference is obvious.
A typical .308 Winchester hunting bullet measures .308 inch in diameter, while a .450 Bushmaster bullet is approximately .452 inch.
That gives the .450 Bushmaster a much larger frontal area.
But frontal diameter isn’t the only factor determining exterior or terminal performance.
A .308 hunting bullet can be significantly more aerodynamic, allowing it to maintain velocity much farther downrange. This is where the .308’s smaller diameter becomes an advantage rather than a disadvantage.
The .450 Bushmaster’s large projectile is designed around a different objective: delivering substantial performance at typical short-to-medium hunting distances rather than maximizing long-range efficiency.
.450 Bushmaster Ballistics
The .450 Bushmaster has earned its reputation as a powerful short-to-medium-range hunting cartridge.
Federal, Hornady and other manufacturers offer loads across a range of bullet weights and constructions. Hornady’s 250-grain FTX is one of the cartridge’s best-known hunting loads.
SAAMI’s published standards recognize a 38,500 psi maximum average pressure for .450 Bushmaster, while the cartridge’s factory performance depends heavily on the specific ammunition and barrel length.
Illinois DNR’s current legal-cartridge reference lists a .450 Bushmaster 250-grain FTX load at 2,200 fps and 2,687 ft-lbs from a 20-inch test barrel, illustrating the cartridge’s intended hunting performance.
Actual results from a particular rifle can differ from published test-barrel figures.
.308 Winchester Ballistics
The .308 Winchester has a much broader ballistic envelope.
Depending on bullet weight and load, factory ammunition can range from relatively light projectiles for specific applications through heavy hunting bullets around 180 grains and beyond.
The cartridge’s major advantage isn’t simply muzzle energy. It is how efficiently the bullet retains velocity and energy after leaving the barrel.
A good .308 hunting bullet can have a substantially higher ballistic coefficient than a typical .450 Bushmaster projectile, resulting in less drop and wind drift as range increases.
That is why the .308 remains popular for both hunting and precision-oriented shooting.
Trajectory: .450 Bushmaster vs. .308
Trajectory is one of the clearest areas where the .308 Winchester beats the .450 Bushmaster.
The .308’s smaller-diameter bullets tend to have much higher ballistic coefficients, allowing them to retain velocity more effectively.
The .450 Bushmaster’s large, relatively blunt projectiles lose velocity much faster.
That means the .450 Bushmaster becomes increasingly difficult to compensate for as range increases.
For a hunter shooting at typical close and moderate distances, the difference may not matter much.
At longer ranges, it becomes a major consideration.
Wind Drift
The same aerodynamic advantage that helps the .308 retain velocity also helps it resist wind.
A hunting bullet with a higher ballistic coefficient generally experiences less lateral displacement from a given crosswind than a lower-BC bullet traveling under comparable conditions.
The .450 Bushmaster therefore requires more attention to wind as range increases.
This is another reason the cartridge’s practical sweet spot is relatively close compared with the .308.
Effective Hunting Distance
It’s important not to assign an arbitrary universal “maximum range” to either cartridge.
A cartridge does not suddenly become ineffective at one particular yardage.
Instead, usable range depends on the ammunition, rifle, accuracy, bullet performance, environmental conditions, shooter skill, and legal requirements.
The .450 Bushmaster is generally best suited to short- and medium-range hunting, while the .308 gives hunters a much wider practical range envelope.
Illinois DNR’s current reference table, for example, lists a 350-yard effective-range figure for its tested .450 Bushmaster load, demonstrating why published load data should be used instead of treating 250 yards as a universal cutoff.
Recoil: .450 Bushmaster vs. .308
Both cartridges produce meaningful recoil.
The amount of recoil a shooter experiences depends on firearm weight, bullet weight, projectile velocity, powder charge, stock geometry and other factors.
The .450 Bushmaster’s heavy projectile and large bore can produce substantial recoil despite its relatively modest operating pressure.
The .308 can also kick noticeably, especially in a lightweight hunting rifle.
Rather than claiming one cartridge always has a specific recoil-energy advantage, the better conclusion is that rifle configuration matters enormously.
A heavy .450 Bushmaster AR can feel very different from a lightweight .308 bolt-action rifle, and vice versa.
Hunting: Which Cartridge Is Better?
For hunting, the right cartridge depends heavily on game, distance, firearm platform and hunting regulations.
Why Choose .450 Bushmaster?
The .450 Bushmaster offers:
- Large-diameter projectiles
- Strong close- and medium-range performance
- Compact AR-15-compatible configurations
- Straight-wall cartridge compatibility where regulations allow it
- A wide selection of purpose-built hunting ammunition
Why Choose .308 Winchester?
The .308 offers:
- Excellent exterior ballistics
- Broad bullet selection
- Strong long-range performance
- Extensive ammunition availability
- Large selection of hunting rifles
- Proven versatility across many hunting applications
The .308 is the more versatile cartridge overall.
The .450 Bushmaster is the more specialized tool.
Straight-Wall Hunting Regulations Matter
One of the biggest reasons hunters consider the .450 Bushmaster is not purely ballistic.
Some jurisdictions impose special requirements on cartridges or firearm types used during particular deer seasons.
Those rules are not uniform nationwide and can change between seasons.
For example, Illinois currently allows qualifying straight-wall centerfire cartridges of .30 caliber or larger for certain single-shot rifle configurations, subject to additional requirements.
Iowa’s 2026–2027 regulations likewise include .450 Bushmaster among cartridges listed as legal under its applicable deer-rifle requirements, which also specify projectile and muzzle-energy criteria.
That is why statements such as “these five states require straight-wall cartridges” can quickly become inaccurate.
Always check the current regulations published by the state’s wildlife agency for the specific season and firearm configuration.
.450 Bushmaster in an AR-15
One of the cartridge’s major attractions is its compatibility with compact AR-pattern platforms designed specifically for .450 Bushmaster.
That gives hunters a way to use a large-bore hunting cartridge in a relatively compact rifle platform.
The result can be particularly useful in thick woods, brush, and other environments where a shorter rifle is convenient.
By comparison, a .308 AR is generally built around the larger AR-10/SR-25 class of platform.
That makes a .450 Bushmaster AR-15 potentially lighter and more compact than a comparable .308 semi-automatic rifle.
.308 in an AR-10
The .308 Winchester is one of the defining cartridges of the larger AR-10 class of rifles.
That platform gives the .308 access to larger receivers, magazines and operating components than a standard AR-15.
The trade-off is size and weight.
A hunter carrying an AR-10 through dense woods may notice the additional weight compared with a compact .450 Bushmaster AR-15.
For a bench or open-country hunting setup, however, that difference may matter much less.
.450 Bushmaster vs. .308 Ammo Availability
This is one category where .308 wins easily.
The .308 Winchester is one of the most widely supported centerfire rifle cartridges in the United States.
Hunters can choose from large numbers of factory loads, bullet weights and projectile designs.
.450 Bushmaster ammunition is available from major manufacturers, but the selection is considerably narrower.
That difference matters if you travel frequently or need to find ammunition away from large sporting-goods retailers.
.450 Bushmaster vs. .308 Ammo Cost
Pricing changes with manufacturer, bullet construction, demand and retailer.
In general, .308 offers more choices at both the budget and premium ends of the market, while .450 Bushmaster is a more specialized cartridge with fewer economy options.
When comparing prices, compare equivalent ammunition.
A premium controlled-expansion hunting load should not be compared with inexpensive .308 FMJ training ammunition.
For a hunting rifle, projectile design is usually more important than saving a few cents per round.
Reloading Considerations
Both cartridges have substantial reloading communities.
The .308 has an enormous component ecosystem, including a huge selection of .308-diameter bullets and published load data.
The .450 Bushmaster has a simpler-looking straight-wall case, but component compatibility is especially important.
Reloaders should use only current, published load data for the exact cartridge and components involved. Do not substitute bullets or powder charges based on similar-looking cartridges.
For either cartridge, a current reloading manual and manufacturer data should take precedence over forum recipes or copied internet load tables.
.450 Bushmaster vs. .308 for Deer Hunting
For deer hunting at ordinary woodland distances, both cartridges can be highly capable when paired with suitable hunting ammunition and a legal, accurate firearm.
The .450 Bushmaster’s large projectile gives it a distinctly different terminal profile, while the .308 provides more ballistic efficiency and range.
If your hunting environment consists primarily of thick timber where shots are relatively close, .450 Bushmaster can make a lot of sense.
If you hunt a mixture of woods, fields and open country, the .308’s broader ballistic envelope becomes increasingly valuable.
.450 Bushmaster vs. .308 for Long Range
This comparison is straightforward.
Choose .308 Winchester for long-range shooting.
Its higher-BC projectiles retain velocity much better, produce less wind drift and require less elevation correction as distance increases.
The .450 Bushmaster wasn’t designed to compete with .308 in long-range precision shooting.
Its purpose is closer-range hunting performance from a compact platform.
Which Is More Versatile?
The .308 Winchester wins easily in versatility.
A single .308 rifle can be configured with ammunition suitable for hunting, recreational shooting, target practice and longer-range applications.
It is also available in an enormous variety of rifle platforms.
The .450 Bushmaster is more specialized.
That isn’t a criticism.
A specialized cartridge can be exactly what a hunter needs when the regulations, terrain and firearm platform favor it.
.450 Bushmaster vs. .308: Pros and Cons
| Category | .450 Bushmaster | .308 Winchester |
|---|---|---|
| Short-range hunting | Excellent | Excellent |
| Long-range shooting | Limited compared with .308 | Excellent |
| Straight-wall applications | Major advantage | Not applicable |
| AR-15 compatibility | Major advantage | No |
| AR-10 compatibility | No | Major advantage |
| Ammunition selection | Moderate | Excellent |
| Ammunition availability | Moderate | Excellent |
| Wind resistance | Limited | Excellent |
| Trajectory | More arched | Flatter |
| Versatility | Moderate | Excellent |
| Compact rifle potential | Excellent | Moderate |
Frequently Asked Questions
Is .450 Bushmaster better than .308?
Not universally. The .308 is superior for range, trajectory, wind resistance and ammunition versatility. The .450 Bushmaster has advantages for short- to medium-range hunting and in jurisdictions where qualifying straight-wall cartridges are permitted or required.
Which has more power, .450 Bushmaster or .308?
Muzzle energy depends on the specific load. Some .308 loads produce more muzzle energy than comparable .450 Bushmaster loads, while the .450 uses a much larger-diameter projectile. Comparing the cartridges requires looking at the complete load rather than caliber alone.
Which has less recoil, .450 Bushmaster or .308?
Both can produce substantial recoil, and firearm weight has a major effect. A lightweight rifle in either caliber can feel considerably more forceful than a heavier firearm firing the same ammunition.
Is .450 Bushmaster good for deer hunting?
Yes. It is designed for short- and medium-range hunting and is listed among legal deer cartridges under certain current state regulations. Hunters must confirm the specific rules for their state, season and firearm.
Is .308 better for deer hunting?
The .308 is an extremely versatile deer cartridge because of its broad ammunition selection and strong external ballistics. It is particularly attractive when hunting can involve longer shots or varied terrain.
Can .450 Bushmaster be used in an AR-15?
Purpose-built AR-15 configurations are available in .450 Bushmaster. The exact components and firearm configuration should always be verified with the manufacturer rather than assuming that any AR-15 can accept the cartridge.
Which cartridge has better long-range performance?
.308 Winchester. Its aerodynamic bullets retain velocity and energy much better and generally produce less trajectory drop and wind drift at distance.
Which is better for hunting in thick woods?
Either can work well, but the .450 Bushmaster is particularly well suited to the close- and medium-range conditions often encountered in dense woods, especially when a compact AR-15 configuration is desirable.
Which ammunition is easier to find?
.308 Winchester, by a wide margin. It has a substantially larger selection of factory loads and is commonly stocked by sporting-goods and ammunition retailers.
Final Verdict: .450 Bushmaster vs. .308
The .450 Bushmaster vs. .308 Winchester debate isn’t really about finding one universal winner.
The .308 Winchester is the better all-around cartridge. It offers superior ballistic efficiency, flatter trajectory, better wind performance, broad ammunition availability, tremendous bullet selection and a wider range of useful applications.
The .450 Bushmaster wins when the requirements are different.
It provides a large-bore projectile in a compact platform and can be particularly attractive for deer hunters operating within straight-wall cartridge regulations. Current Illinois and Iowa regulations demonstrate why state-specific legal research remains an important part of choosing a hunting cartridge.
For a hunter who expects longer shots and wants maximum versatility, .308 Winchester is the stronger choice.
For a hunter primarily working inside typical woodland distances and looking for a compact large-bore platform, .450 Bushmaster can be an excellent specialized option.
The smartest way to choose is to start with your hunting regulations, expected shooting distance, terrain, firearm platform and ammunition availability, then select the cartridge that actually fits those requirements.