450 Bushmaster Ballistic Data Guide: Gel Test Results, Velocity Charts & Load Comparisons

The 450 Bushmaster was born from a simple concept: put the biggest bullet possible through an AR-15 platform. Developed from Tim LeGendre’s original “Thumper” concept and refined by Hornady, the 450 Bushmaster fires a .452-caliber bullet at over 2,200 fps from a modified AR-15. It hits like a hammer at close range and — critically for hunters in Michigan, Indiana, Ohio, and Iowa — it meets straight-wall cartridge requirements for rifle hunting in zones where bottleneck cartridges are prohibited.

If you’re looking for a cartridge that drops whitetails with authority inside 200 yards, feeds through an AR-15 or bolt action, and complies with straight-wall regulations, the 450 Bushmaster is one of your best options. This guide breaks down the actual ballistic performance behind five common loads.

Looking for 450 Bushmaster ammunition? Browse our full 450 Bushmaster ammo selection at Tatted Tacticals.

1. What Is the 450 Bushmaster?

The 450 Bushmaster traces back to Colonel Jeff Cooper’s “Thumper” concept — a large-bore, semi-automatic rifle capable of taking big game at moderate range. Tim LeGendre of LeMag Firearms developed the initial cartridge, and Hornady refined it into the commercially viable 450 Bushmaster in 2007.

Key specifications:

• Bullet diameter: .452 inches (11.5mm)
• Case type: Straight-wall, rebated rim
• Case length: 1.700 inches (43.2mm)
• Overall length: 2.260 inches (57.4mm)
• Maximum pressure (SAAMI): 38,500 psi
• Parent case: .284 Winchester (modified)
• Platform: AR-15 (modified bolt, barrel, magazine)
• Typical barrel length: 16″–20″

The 450 Bushmaster fits in a standard AR-15 lower receiver with a modified upper, bolt, barrel, and single-stack magazine. It also runs in dedicated bolt-action rifles from Ruger (American Ranch), Savage, and others. The straight-wall case design is what makes it legal in states that restrict bottleneck rifle cartridges for deer hunting.

The takeaway: The 450 Bushmaster is a big-bore, straight-wall cartridge designed for the AR-15 platform. It exists because hunters in straight-wall-only states needed a rifle-platform alternative to shotgun slugs, and it delivers dramatically better performance than any slug gun.

2. 450 Bushmaster Ballistic Data — 5 Factory Loads Compared

All velocities from a 20-inch test barrel unless noted.

The ballistic coefficients are low — .180 to .210 G1 — which is typical for large-diameter, blunt-profile pistol-caliber bullets. This means the 450 Bushmaster loses velocity and energy quickly compared to traditional rifle cartridges. The cartridge is designed for shots inside 250 yards, and the data reflects that limitation honestly.

The Bear Creek Ballistics 240gr HV load stands out with its higher velocity (2,365 fps) and nearly 3,000 ft-lbs of muzzle energy. For hunters who want maximum energy delivery inside 150 yards, it’s the hottest factory option available. The Hornady BLACK 250gr FTX is the most widely available and consistently accurate factory load.

The takeaway: The 450 Bushmaster generates 2,400–2,980 ft-lbs of muzzle energy with a .452-caliber bullet. That’s more muzzle energy than a .308 Winchester. The trade-off is rapid energy loss beyond 150 yards due to low ballistic coefficients.

3. Gel Test Results and Terminal Performance

The 450 Bushmaster’s terminal performance at close range is devastating. A .452-caliber bullet at over 2,000 fps creates wound channels that rival many magnum rifle cartridges.

Hornady FTX 250gr — Gel Performance

• Impact velocity (50 yards): ~2,050 fps
• Penetration depth: 16–19 inches
• Expanded diameter: .700″–.780″
• Weight retention: 85–92%

The FTX (Flex Tip eXpanding) polymer tip initiates reliable expansion, and the InterLock ring prevents the jacket from separating. The expanded diameter approaching .780″ creates a massive wound channel — significantly wider than any .30-caliber rifle bullet. This is why whitetails hit with the 450 Bushmaster rarely go far.

Federal Power-Shok 300gr JHP — Gel Performance

• Impact velocity (50 yards): ~1,760 fps
• Penetration depth: 20–24 inches
• Expanded diameter: .650″–.750″
• Weight retention: 75–85%

The heavier 300gr bullet at lower velocity takes a different approach — more penetration, less explosive expansion. The JHP opens to .650″–.750″ and drives deep through tissue and bone. This is the better choice for black bear or larger deer taken at quartering angles where you need the bullet to reach vitals through heavier body structure.

Winchester Deer Season XP 250gr — Gel Performance

• Impact velocity (50 yards): ~2,050 fps
• Penetration depth: 15–18 inches
• Expanded diameter: .720″–.800″
• Weight retention: 80–88%

The Deer Season XP is designed for rapid expansion and maximum energy dump. It opens aggressively and creates a wide wound channel in the first 6–8 inches of penetration. The trade-off is slightly less total penetration compared to the Hornady FTX — 15–18 inches vs 16–19 inches — but for broadside shots on deer, both are more than adequate.

The takeaway: The 450 Bushmaster creates wound channels that are dramatically larger than standard rifle cartridges. A .452-caliber bullet expanding to .700″–.800″ is in a different class from a .308-caliber bullet expanding to .550″. At close range (under 150 yards), terminal performance is exceptional.

4. Bullet Drop Charts — 50 to 300 Yards

Trajectory data assumes a 150-yard zero, which is the most common zero distance for the 450 Bushmaster. Drop values in inches.

The 450 Bushmaster drops quickly past 150 yards — 16 inches at 250 yards and over 30 inches at 300 yards with the best loads. This is the reality of a large, blunt, low-BC bullet. The cartridge is at its best inside 200 yards, and shots past 250 yards require significant holdover or turret adjustment.

With a 150-yard zero, you have a point-blank range of approximately 175 yards on deer-sized game. That covers the vast majority of shots in the Midwest timber and agricultural settings where the 450 Bushmaster is most popular.

The takeaway: Zero your 450 Bushmaster at 150 yards. This gives you a point-blank range out to 175 yards — you can hold center-of-chest and hit vitals without thinking about holdover. Past 200 yards, know your drop chart.

5. Barrel Length and Velocity — 16″ vs 20″

You lose approximately 30 fps per inch of barrel with the 450 Bushmaster. A 16-inch barrel (common for AR-15 builds and the Ruger American Ranch Rifle) costs you 125 fps and about 300 ft-lbs of energy. That’s significant, but a 16-inch barrel at 2,075 fps still hits harder than a 12 gauge slug at any range.

The 16-inch barrel is the most popular configuration for deer hunting — it’s maneuverable in a tree stand, light enough for all-day carries, and still generates over 2,300 ft-lbs of muzzle energy. The 20-inch barrel is better for maximum performance but adds weight and length that many hunters don’t want in thick timber.

The takeaway: A 16-inch barrel is the practical choice for hunting. You sacrifice 125 fps but gain significant maneuverability. A 20-inch barrel is optimal if maximum energy and range matter more than portability.

6. The Straight-Wall Advantage — Why Michigan Hunters Love It

Several Midwest states restrict rifle hunting in certain zones to straight-wall cartridges only. This regulation was designed to limit effective range in densely populated agricultural areas where a rifle bullet could travel for miles. The states with straight-wall rifle allowances include:

• Michigan — Zone 3 (southern lower peninsula) allows straight-wall cartridges
• Indiana — Statewide allowance for straight-wall cartridges
• Ohio — Statewide allowance for straight-wall cartridges
• Iowa — Straight-wall cartridges allowed for deer

Before straight-wall rifles were legal, hunters in these zones were limited to shotguns with slugs or muzzleloaders. The 450 Bushmaster transformed the experience — it’s dramatically more accurate than a slug gun (1–2 MOA vs 4–6 MOA), has double the effective range, and feeds through a semi-automatic or bolt-action rifle instead of a pump shotgun.

For Michigan hunters in particular, the 450 Bushmaster has become the de facto standard for southern-zone deer hunting. The Ruger American Ranch Rifle in 450 Bushmaster is one of the most popular deer rifles in the Midwest, offering reliable accuracy at a reasonable price point.

The takeaway: The 450 Bushmaster’s primary market is hunters in straight-wall-only states. If you hunt in Michigan, Indiana, Ohio, or Iowa, this cartridge gives you rifle-grade accuracy and energy within legal requirements.

7. 450 Bushmaster vs 45-70 Government

The 45-70 hits harder at the muzzle (3,032 ft-lbs vs 2,686 ft-lbs with modern loads), but both cartridges lose energy rapidly at range. The 450 Bushmaster’s advantage is platform — it runs through an AR-15 with semi-automatic capability, while the 45-70 is primarily a lever-action or single-shot cartridge.

For follow-up shots on hogs or as a bear defense platform, the 450 Bushmaster’s semi-automatic operation gives it a practical edge. For maximum energy on large game, the 45-70 with modern lever-action loads delivers more punch.

The takeaway: Both are excellent straight-wall options. The 450 Bushmaster offers semi-auto capability in an AR-15. The 45-70 hits harder from a lever gun. For deer, both are overkill inside 150 yards.

8. 450 Bushmaster vs 350 Legend — Which Straight-Wall Wins?

The 450 Bushmaster hits 52% harder at the muzzle and creates a significantly larger wound channel. The 350 Legend generates less than half the recoil and costs 30–40% less per round. For youth hunters, recoil-sensitive shooters, or anyone who wants a mild-shooting deer rifle, the 350 Legend is the better choice.

For hunters who want maximum stopping power and don’t mind the recoil, the 450 Bushmaster delivers a different level of terminal performance. Deer hit with the 450 Bushmaster typically drop within sight, while the 350 Legend — though fully adequate — sometimes requires short tracking.

The takeaway: The 450 Bushmaster is the harder-hitting option. The 350 Legend is the easier-shooting, cheaper-to-feed option. Both kill deer effectively inside 200 yards. Choose based on your recoil tolerance and budget.

9. 450 Bushmaster for Hunting — Effective Range by Game

The 450 Bushmaster is a 200-yard deer cartridge with energy to spare. Inside 200 yards, it hits harder than a .30-06 at the same distance. The limitation isn’t energy — it’s trajectory. Past 200 yards, the rainbow trajectory makes precise shot placement increasingly difficult without a rangefinder and turret dial.

For black bear, the 300gr Federal JHP provides deeper penetration through heavy bone and muscle. Use the 250gr FTX for deer and the 300gr loads for bear or situations requiring maximum penetration.

The takeaway: The 450 Bushmaster is a 200-yard cartridge. Inside that range, it hits harder than most traditional rifle cartridges. Past 200 yards, trajectory becomes the limiting factor. Match your expectations to the cartridge’s design envelope.

10. Frequently Asked Questions

Is the 450 Bushmaster legal in Michigan?

Yes. Michigan legalized straight-wall cartridges for firearm deer season in the limited-firearm zone (Zone 3, southern lower peninsula) in 2014. The 450 Bushmaster meets all requirements. Always verify current regulations with the Michigan DNR before your hunt.

Can I use my regular AR-15 lower for 450 Bushmaster?

Yes. The 450 Bushmaster uses a standard AR-15 lower receiver. You need a dedicated upper receiver assembly with a .452-bore barrel, a 450 Bushmaster bolt (larger bolt face), and single-stack magazines designed for the cartridge. The buffer, spring, and trigger can remain standard.

Is 450 Bushmaster good for home defense?

It’s effective but not ideal. The 450 Bushmaster generates significant overpenetration through interior walls — far more than 5.56/.223 or pistol calibers. For home defense in populated areas, a 5.56 AR-15 or 12 gauge with buckshot is a more appropriate choice. The 450 Bushmaster is designed for hunting, not interior use.

How does 450 Bushmaster recoil compare to 12 gauge slugs?

The 450 Bushmaster in an AR-15 platform generates roughly 25 ft-lbs of free recoil — comparable to a .308 Winchester. A 12 gauge slug from a pump shotgun generates 40–50 ft-lbs. The AR-15’s buffer spring system and the rifle’s weight absorb recoil significantly better than a pump shotgun, making the 450 Bushmaster much more pleasant to shoot.

What’s the maximum effective range of the 450 Bushmaster?

For hunting, 200–225 yards is the practical limit. The cartridge retains enough energy for deer-sized game at 225 yards, but bullet drop exceeds 16 inches at 250 yards (with a 150-yard zero), making precise shot placement difficult without a turret scope or extensive practice at distance.

Ready to gear up for straight-wall season? Shop 450 Bushmaster ammunition at Tatted Tacticals — we carry Hornady, Federal, Winchester, and more.