The exact bullet diameter of the 360 Buckhammer is 0.3580 inches (9.093 millimeters). Despite its numerical cartridge designation of “360,” the round does not use a .360-inch projectile, relying instead on standard .358-inch-class bullets. Bullet diameter refers to the outer width of the projectile, which differs from bore diameter (0.3500 inches across the lands) and groove diameter (0.3580 inches across the rifling). SAAMI specifications confirm that factory 360 Buckhammer loads strictly mandate .358-inch projectiles to achieve optimal gas sealing and rifling engagement.
360 Buckhammer Bullet Diameter
| Specification | 360 Buckhammer |
| Nominal Bullet Diameter | 0.3580 in |
| Bullet Diameter In Inches | 0.3580 in |
| Bullet Diameter In Millimeters | 9.093 mm |
| Groove Diameter | 0.3580 in |
| Bore Diameter | 0.3500 in |
| Typical Bullet Weights | 180 gr – 200 gr |
| Case Length | 1.800 in |
| Overall Cartridge Length | 2.380 in |
| Maximum Pressure | 50,000 PSI |
Explain The Specifications
What Is The 360 Buckhammer Bullet Diameter?
The nominal bullet diameter for the 360 Buckhammer is 0.3580 inches. Developed by Remington and standardized by SAAMI, the cartridge was designed specifically to capitalize on the deep catalog of existing .358-caliber rifle bullets. The “360” name is a marketing designation rather than a true physical caliber measurement.
360 Buckhammer Bullet Diameter In Inches
In imperial measurements, the 360 Buckhammer projectile measures exactly 0.3580 inches with a SAAMI manufacturing tolerance of +0.0000 / -0.0030 inches. This places it directly in the traditional .35-caliber rifle family alongside historic cartridges like the .35 Remington and .35 Whelen.
360 Buckhammer Bullet Diameter In Millimeters
When converted to the metric system, a 0.3580-inch bullet equals 9.093 millimeters (commonly rounded to 9.09 mm). Metric technical drawings reference the projectile diameter as 9.093 mm -0.076 mm.
360 Buckhammer Bullet vs Bore Diameter
Bore diameter refers to the inside diameter of the barrel before rifling grooves are cut (measured land-to-land). For the 360 Buckhammer, the bore diameter is 0.3500 inches (8.890 mm). The bullet diameter (0.3580 inches) is larger than the bore diameter so that the jacket material swages into the rifling grooves upon firing to form a gas-tight seal and impart rotational stability.
360 Buckhammer Groove Diameter
Groove diameter is the measurement from the bottom of one rifling groove to the bottom of the opposite groove. The 360 Buckhammer barrel specification calls for a groove diameter of 0.3580 inches (9.093 mm), matching the maximum nominal bullet diameter to ensure full engagement with the barrel’s rifling.
360 Buckhammer Bullet Weights
While bullet diameter remains fixed at 0.3580 inches, projectile mass varies based on application. Factory offerings primarily feature 180-grain and 200-grain soft-point loads optimized for lever-action tubular magazines and medium game hunting.
360 Buckhammer Dimensions
The official SAAMI dimensional drawing defines the cartridge geometry to ensure safe chambering across all manufactured firearms.
| Dimension | Measurement |
| Bullet Diameter | 0.3580 in (9.093 mm) |
| Bore Diameter | 0.3500 in (8.890 mm) |
| Groove Diameter | 0.3580 in (9.093 mm) |
| Case Length | 1.800 in (45.72 mm) |
| Overall Cartridge Length | 2.380 in (60.45 mm) |
| Base Diameter | 0.4214 in (10.704 mm) |
| Neck Diameter | 0.3840 in (9.754 mm) |
| Rim Diameter | 0.5060 in (12.852 mm) |
| Maximum Pressure | 50,000 PSI |
Bullet Weights
Factory 360 Buckhammer ammunition focuses on heavy-for-caliber construction to deliver momentum and rapid expansion within straight-wall state hunting zones. Bullet weight alters projectile length and sectional density, but the 0.358-inch diameter remains constant.
| Bullet Weight | Example Load | Bullet Type | Advertised Velocity |
| 180 gr | Remington Core-Lokt | Soft Point (SP) | 2,400 fps |
| 200 gr | Remington Core-Lokt | Soft Point (SP) | 2,217 fps |
| 180 gr | Federal Power-Shok | Soft Point (SP) | 2,400 fps |
360 Buckhammer vs .357 Magnum
While both cartridges share bullet diameters in the .357–.358 range, they are built on drastically different case platforms and pressure ceilings.
| Specification | 360 Buckhammer | .357 Magnum |
| Bullet Diameter | 0.3580 in | 0.3570 in – 0.3580 in |
| Typical Bullet Weight | 180 gr – 200 gr | 125 gr – 158 gr |
| Case Length | 1.800 in | 1.290 in |
| Overall Length | 2.380 in | 1.590 in |
| Typical Velocity | 2,217 – 2,400 fps | 1,450 fps (Handgun) / 1,850 fps (Rifle) |
| Typical Muzzle Energy | 2,180 – 2,300 ft-lbs | 550 – 1,200 ft-lbs |
Note: Similar bullet diameters do not make cartridges interchangeable. Chambering a .357 Magnum in a 360 Buckhammer rifle or attempting to interchange loaded rounds will cause mechanical failure or unsafe headspace conditions.
360 Buckhammer vs 350 Legend
Shooters frequently evaluate the 360 Buckhammer against the .350 Legend for straight-wall hunting legality. Their exact projectile diameters differ significantly despite the similar naming conventions.
| Specification | 360 Buckhammer | 350 Legend |
| Bullet Diameter | 0.3580 in | 0.3570 in |
| Diameter In mm | 9.093 mm | 9.068 mm |
| Typical Bullet Weight | 180 gr – 200 gr | 150 gr – 180 gr |
| Case Length | 1.800 in | 1.710 in |
| Overall Length | 2.380 in | 2.260 in |
The 360 Buckhammer uses a true 0.358-inch rifle bullet diameter, while the .350 Legend relies on a slightly narrower 0.357-inch diameter projectile. Reloaders cannot safely swap bullets between these two cartridges without matching die and neck specs.
360 Buckhammer Bullet Diameter: Exact Measurement
The exact bullet diameter of the 360 Buckhammer is 0.3580 inches (9.093 mm).
Understanding standard firearm dimensional terms helps explain why multiple measurements exist for one barrel:
- Nominal Bullet Diameter (0.3580 in): The physical outer diameter of the unfired projectile.
- Bore Diameter (0.3500 in): The minimum inner barrel diameter across the raised lands.
- Groove Diameter (0.3580 in): The maximum inner barrel diameter across the cut grooves, matching the bullet’s width to establish an airtight seal upon ignition.
Frequently Asked Questions
What is the bullet diameter of 360 Buckhammer?
The exact bullet diameter of the 360 Buckhammer is 0.3580 inches.
What is 360 Buckhammer bullet diameter in mm?
In metric units, the 360 Buckhammer bullet diameter measures 9.093 mm.
Is 360 Buckhammer a .358 caliber bullet?
Yes. The cartridge utilizes standard .358-inch-class rifle projectiles, the same caliber family used by the .35 Remington and .35 Whelen.
What is the bore diameter of 360 Buckhammer?
The SAAMI specification for 360 Buckhammer bore diameter (land-to-land measurement) is 0.3500 inches (8.890 mm).
What is the groove diameter of 360 Buckhammer?
The SAAMI specification for 360 Buckhammer groove diameter (groove-to-groove measurement) is 0.3580 inches (9.093 mm).
Is 360 Buckhammer the same diameter as 357 Magnum?
They use nearly identical bullet diameters (.358 in for 360 Buckhammer vs .357–.358 in for .357 Magnum), but the cartridges are not interchangeable due to differences in case length, rim geometry, and overall dimensions.
Is 360 Buckhammer the same diameter as 350 Legend?
No. The 360 Buckhammer uses a 0.3580-inch bullet diameter, whereas the .350 Legend uses a slightly smaller 0.3570-inch bullet diameter.
What bullet weights are available for 360 Buckhammer?
Factory ammunition currently features 180-grain and 200-grain soft-point loads. Reloaders can use .358-caliber projectiles ranging from 150 to 220 grains, provided they feed reliably in lever-action magazines.
What is the case diameter of 360 Buckhammer?
The 360 Buckhammer has a base diameter of 0.4214 inches, tapering to a neck diameter of 0.3840 inches, with a rim diameter of 0.5060 inches.
Is 360 Buckhammer a 35 caliber?
Yes, the 360 Buckhammer is functionally a medium-bore .35-caliber rifle cartridge despite its nominal “360” model name.
How does 360 Buckhammer bullet diameter compare with 350 Legend?
The 360 Buckhammer is 0.001 inches larger in projectile diameter (0.358 in vs 0.357 in) than the .350 Legend.
How does 360 Buckhammer bullet diameter compare with 357 Magnum?
Both share a 0.358-inch nominal bullet sizing, but 360 Buckhammer bullets are designed with heavy rifle jackets meant for higher velocities (2,200–2,400 fps) compared to standard handgun projectiles.