.450 Bushmaster

If you’ve ever watched a deer absorb a hit and keep moving and thought “I need more,” the .450 Bushmaster was designed with you specifically in mind. This is a straight-walled, large-bore rifle cartridge built to run in AR-15 platforms and hit like a truck doing it. It fires a .452-inch bullet — the same diameter as your .45 ACP pistol rounds — but with a whole lot more powder behind it. Tim LeGendre of LeMag Firearms conceived the idea, Hornady made it real, and Michigan deer hunters adopted it like a religion.

The concept came from Tim LeGendre, who wanted a cartridge that could deliver a .45-caliber punch through an AR-15 with a single-shot setup. He handed the idea to Hornady, and in 2000 they put it into production as the .450 Bushmaster. The timing was good — Midwest states were tightening their deer hunting regulations to require straight-wall cartridges in certain zones, and hunters needed something more powerful than pistol-caliber options. The .450 Bushmaster answered that call loudly. Michigan hunters especially took to it, and it’s been synonymous with Great Lakes deer hunting ever since. Ruger and other manufacturers started chambering rifles for it, and now it’s one of the most recognizable hunting cartridges in straight-wall country.

Deer hunting is the primary mission, and it excels at it. Inside 250 yards, the .450 Bushmaster is an absolute sledgehammer on whitetail, black bear, and hogs. It’s also perfectly suited for straight-wall-only hunting zones in states like Michigan, Ohio, Indiana, and Iowa. Some hunters use it for hog control where follow-up shots matter and the AR platform’s capacity is an advantage. It’s not a long-range cartridge — it’s a woods cartridge, a stand cartridge, a thick-cover cartridge. If your shots are inside 200 yards and you want the deer to stay where it falls, this is a serious option worth considering.

A 250-grain .450 Bushmaster load leaves the muzzle at around 2,200 feet per second and hits with approximately 2,700 foot-pounds of energy. That’s serious business for a cartridge running through an AR-15 platform. Heavier 260 and 300-grain loads are available and trade some velocity for even more mass. The trade-off is trajectory — this is not a flat shooter. By 200 yards you’re looking at significant drop, so ranging your shots matters. But if you keep it in its lane, the terminal performance is hard to argue with. It hits hard, it expands well, and things tend to stop.

Hornady does the heavy lifting on .450 Bushmaster ammo and offers several excellent hunting loads including their FTX (Flex Tip) in their LEVERevolution line, which is ironic given that this cartridge runs in a semi-auto. Federal, Remington, and Winchester all load it as well. You’ll find options in 250, 260, and 300-grain weights. Soft-points work great, polymer-tipped loads give you better ballistic coefficients for the longer shots, and if you’re handloading, .452-inch bullets are extremely common since they’re shared with the .45 ACP family. Components are easy to find.

The .450 Bushmaster runs in a modified AR-15 platform — you’ll need a dedicated upper receiver with the appropriate barrel and a single-stack magazine arrangement. Many states that allow it for deer hunting actually require single-shot or limited-capacity setups anyway, so this fits the legal requirements cleanly. Ruger’s American Ranch rifle and bolt-action options are also available if you prefer a traditional action. Mossberg makes a bolt gun in this chambering too. It’s also been chambered in lever-action rifles, which is somehow both unnecessary and completely awesome at the same time.

We stock .450 Bushmaster ammo and rifles, and we talk to straight-wall hunters every season who are figuring out what they want to run. If you’re on the fence between the .450 Bushmaster and something like the .400 or .350 Legend, come in and have the conversation. We’ll lay out the actual differences — recoil, ammo cost, availability, platform — and let you make the call. No pressure, just real talk from people who spend time in the woods too. We’re here when you’re ready.