300 Blackout vs 350 Legend: The Best Deer Rifle Choice

Updated August 2026. Velocity and energy figures from published factory load data.

The 300 Blackout vs 350 Legend comparison comes up constantly because both cartridges promise the same thing on the surface: meaningful deer performance from an AR-15 with nothing more than a barrel swap. They arrive at it from opposite directions. 350 Legend was built by Winchester in 2019 to satisfy straight wall cartridge hunting laws in the Midwest. 300 Blackout was built in 2011 to make a suppressed short barrel rifle work properly. Understanding which problem you actually have decides the answer.

300 Blackout vs 350 Legend at a glance

The straight wall rule decides it for many hunters

Several Midwestern states, including Ohio, Michigan, Indiana and Iowa, restrict deer hunting to straight wall cartridges in some or all zones. 350 Legend exists precisely because of those rules. 300 Blackout is a bottleneck cartridge and is not legal for deer under them.

If you hunt in one of those states, the 300 Blackout vs 350 Legend debate is already settled and no ballistic argument changes it. Check your current state regulations before buying anything, because these rules are revised more often than most hunters expect.

For everyone else, the decision opens back up, and it turns on whether you intend to shoot suppressed.

300 Blackout vs 350 Legend on energy and range

350 Legend hits harder in daylight terms. A 145gr load runs roughly 2,350 fps for about 1,780 ft lbs, and a 180gr load around 2,100 fps for roughly 1,760 ft lbs. That is meaningfully more than 300 Blackout’s roughly 1,350 ft lbs from a 125gr supersonic, and it holds usefully to about 200 yards on deer sized game.

300 Blackout answers with versatility rather than raw output. It spans 110gr supersonic hunting loads to 220gr subsonics, and it delivers nearly all of its performance from a 9 inch barrel where 350 Legend wants 16 to 20 inches to reach its published numbers. Our 300 Blackout ballistics chart shows exactly how little the shorter barrel costs.

So in the 300 Blackout vs 350 Legend energy column, the Legend wins. In the energy per inch of barrel column, it is not close in the other direction.

The suppressor divide

This is where the two part company completely. 300 Blackout was engineered subsonic first: 190gr to 220gr factory loads at roughly 1,000 to 1,050 fps that feed from standard AR magazines and turn a suppressed rifle genuinely hearing safe. Our subsonic versus supersonic guide covers running both from one rifle.

350 Legend has some subsonic offerings, but the ecosystem is thin, bullet selection for low velocity expansion is limited, and the cartridge was never designed around the requirement. If a can is in your safe or on your wish list, the 300 Blackout vs 350 Legend question answers itself.

Conversion cost and magazines

Conversion cost is where the 300 Blackout vs 350 Legend maths favours the older cartridge. 300 Blackout converts an AR-15 with a barrel alone. Same bolt, same magazines, same everything else. That single fact built the cartridge’s market.

350 Legend needs a barrel, a bolt with the correct case head, and its own magazines. It is still a straightforward conversion, just not the free lunch that 300 Blackout offers. Budget accordingly if you already own an AR-15.

Ammunition cost runs in the Legend’s favour. Winchester’s volume production keeps 350 Legend competitive with common hunting calibers, while 300 Blackout carries a modest premium, particularly for subsonic and premium hunting loads. Compare the current range on our 300 Blackout ammo shelf.

Bullet selection and terminal performance

An underrated part of the 300 Blackout vs 350 Legend comparison is what is available to load. 350 Legend uses .357 diameter projectiles, and because the cartridge is young and purpose built for deer, most factory offerings are expanding hunting bullets tuned for its velocity window. That focus is a strength: it is hard to buy the wrong 350 Legend load for deer.

300 Blackout draws on the enormous .308 projectile pool, which cuts both ways. You can buy 110gr copper hunting bullets, 125gr match projectiles, 150gr soft points and 220gr subsonic expanders for the same rifle, which is unmatched versatility. You can also buy 220gr full metal jacket practice ammunition that will pencil straight through a deer, and plenty of people have done exactly that by accident. Choose deliberately, and our load selection guide covers what to look for at short barrel speeds.

Recoil and shootability

Both are gentle. 350 Legend was deliberately engineered for low recoil so younger and recoil sensitive hunters could shoot it comfortably, and it delivers on that, producing noticeably less kick than 450 Bushmaster or 12 gauge slugs in the same role. Supersonic 300 Blackout is similarly mild, and its subsonic loads barely register.

The verdict

Choose 350 Legend if: you hunt in a straight wall cartridge state, you want maximum energy on deer inside 200 yards, ammunition cost matters, and suppressors are not part of your plan.

Choose 300 Blackout if: you own or want a suppressor, you run a short barrel, you want one rifle that switches between quiet subsonic and full power supersonic by changing magazines, or you want the cheapest possible AR-15 conversion. See also how it stacks up against the AR’s native round in our 300 Blackout vs 5.56 breakdown and against the Soviet standard in 300 Blackout vs 7.62×39.

Frequently asked questions

Which hits harder, 300 Blackout or 350 Legend?

350 Legend, by roughly 400 ft lbs at the muzzle in typical supersonic loads. The 300 Blackout vs 350 Legend gap narrows in short barrels, where the Legend loses more velocity than the Blackout does.

Is 300 Blackout legal for deer in straight wall states?

No. It is a bottleneck cartridge and does not meet straight wall requirements. That is the specific problem 350 Legend was created to solve. Always confirm current regulations with your state wildlife agency.

Can I use the same AR-15 lower for both?

Yes. Both are AR-15 cartridges, so one lower receiver serves either upper. The difference is that 350 Legend needs its own bolt and magazines while 300 Blackout uses standard AR-15 parts.

In 300 Blackout vs 350 Legend, which is better suppressed?

300 Blackout, decisively. It was designed around subsonic performance and has a deep selection of heavy subsonic loads. 350 Legend’s subsonic support is limited by comparison.

What is the effective range of each?

Roughly 200 yards for 350 Legend on deer, and roughly 250 yards for supersonic 300 Blackout, with subsonic 300 Blackout limited to about 150 yards by trajectory. Model your exact load in our ballistics calculator.

Which is better for a first deer rifle?

350 Legend if you hunt straight wall country or want the simplest, hardest hitting option with mild recoil. 300 Blackout if versatility and suppressed shooting matter more. For background on the newer cartridge, the 350 Legend entry covers its design brief.