The 360 Buckhammer is a rimmed, straight walled centerfire rifle cartridge featuring a standard maximum bullet diameter of 0.358 inches (9.1 mm).The maximum case length is 1.800 inches (45.72 mm), and the maximum overall cartridge length is restricted to 2.500 inches (63.50 mm) to ensure compatibility with standard lever action rifles. The case utilizes a prominent rim diameter of 0.506 inches (12.85 mm) and tapers slightly from a base diameter of 0.4195 inches (10.66 mm) to a case mouth diameter of 0.3798 inches (9.65 mm). Ammunition for this caliber is most commonly found in 180 grain and 200 grain bullet weights. Exact dimensions and operating pressures can vary slightly depending on allowable manufacturing tolerances and specification systems.
360 Buckhammer Dimensions
| Dimension | Specification | Source | Notes |
| Bullet Diameter | 0.358 in (9.1 mm) | SAAMI | Standard for .35 caliber rifle projectiles. |
| Case Length | 1.800 in (45.72 mm) | SAAMI | Maximum case length; fits within 1.800 inch hunting regulations. |
| Overall Cartridge Length | 2.500 in (63.50 mm) | SAAMI | Maximum overall length for standard lever action receivers. |
| Rim Diameter | 0.506 in (12.85 mm) | SAAMI | Matches the parent 30-30 Winchester rim. |
| Case Diameter (Base) | 0.4195 in (10.66 mm) | SAAMI | Measured just above the extractor groove. |
| Shoulder Diameter | N/A | N/A | Straight walled cartridge, no shoulder. |
| Neck Diameter | 0.3798 in (9.65 mm) | SAAMI | Maximum external diameter at the case mouth. |
| Base Diameter | 0.4195 in (10.66 mm) | SAAMI | Uniform with the body prior to the rim. |
| Case Capacity | ~ 44.0 gr H2O | Industry | Varies slightly based on the brass manufacturer. |
| Maximum Pressure | 50,000 psi | SAAMI | Governed by SAAMI specifications for modern rifles. |
Understanding The 360 Buckhammer Dimensions
- Bullet Diameter: The measurement across the widest point of the bullet. For the 360 Buckhammer, this is specified as 0.358 inches. This dimension ensures the projectile seals properly within the barrel rifling to trap expanding gases and generate high velocity.
- Case Length: The length of the empty brass cylinder from the base to the case mouth, maxing out at 1.800 inches. This specific length allows the cartridge to be used for hunting in states that mandate straight walled cartridges with a maximum length of 1.800 inches.
- Overall Cartridge Length (OAL): The total length of the fully assembled round from the base to the tip of the bullet, strictly capped at 2.500 inches. OAL directly influences whether a cartridge will feed and cycle properly through a tubular magazine and lever action elevator.
- Rim Diameter: The diameter of the flange at the very bottom of the case, measuring 0.506 inches. The firearm extractor hooks onto this rim to reliably pull the spent casing out of the chamber.
- Case Diameter: The width of the cartridge body at the base. At 0.4195 inches, the cartridge body features a very slight taper up to the 0.3798 inch neck to aid in extraction.
- Case Capacity: Measured in grains of water, this represents the internal volume of the empty case. It dictates how much gunpowder the case can safely hold to propel heavy bullets efficiently.
- Maximum Pressure: The peak internal pressure generated when the cartridge is fired. Standard SAAMI limits set this at 50,000 psi to ensure modern firearms operate safely without catastrophic failure.
360 Buckhammer Cartridge Dimensions In Inches And Millimeters
For engineers, reloaders, and international shooters, below are the primary 360 Buckhammer measurements converted accurately between imperial and metric systems.
| Dimension | Inches (SAAMI Max) | Millimeters (Equivalent) |
| Bullet Diameter | 0.358 in | 9.09 mm |
| Case Length | 1.800 in | 45.72 mm |
| Overall Length | 2.500 in | 63.50 mm |
| Rim Diameter | 0.506 in | 12.85 mm |
| Base Diameter | 0.4195 in | 10.66 mm |
| Neck Diameter | 0.3798 in | 9.65 mm |
360 Buckhammer Case Dimensions
The 360 Buckhammer is defined by a rimmed, straight walled case derived directly from the classic 30-30 Winchester parent case.The official maximum case length is 1.800 inches (45.72 mm), with a nominal trim to length for reloaders sitting slightly shorter.The base diameter measures 0.4195 inches, and the rim extends wider to 0.506 inches.
Because the case is essentially a blown out 30-30 Winchester with most of the body taper removed, it offers a robust internal volume for its compact length. This capacity is highly efficient, allowing the 360 Buckhammer to push heavy 0.358 caliber bullets at high hunting velocities using appropriate charges of rifle powder. The 1.800 inch case length restriction ensures it complies with specific midwestern straight wall cartridge hunting laws.
360 Buckhammer Bullet Diameter
The standardized maximum bullet diameter for the 360 Buckhammer is 0.358 inches (9.1 mm).This is a massive advantage because 0.358 caliber bullets are traditionally used in legacy cartridges like the 35 Remington and 35 Whelen.
The standard 360 Buckhammer barrel features a groove diameter of 0.358 inches and a bore or land diameter of 0.349 inches. Firing a 0.358 inch bullet down this barrel forces the copper jacket to engrave tightly into the rifling, creating the necessary spin to stabilize the projectile accurately in flight. Standard rifles for this caliber typically utilize a 1 in 12 inch twist rate to properly stabilize heavy 180 grain and 200 grain hunting bullets.
360 Buckhammer Overall Length
The SAAMI maximum overall cartridge length (OAL) for the 360 Buckhammer is 2.500 inches (63.50 mm). This number is a hard limit designed to guarantee that the cartridge will fit perfectly inside the action of standard lever action rifles, such as those modeled after the Marlin 336 or Henry series.
Typical factory cartridge length varies based on the bullet profile. Factory ammunition often measures between 2.350 and 2.500 inches to ensure proper cycling. Because the cartridge is designed for tubular magazines, bullets must feature a flat nose or a soft polymer tip. Pointed bullets seated to the maximum length pose a severe safety risk, as recoil can cause a sharp tip to detonate the primer of the cartridge sitting directly in front of it in the magazine tube.
360 Buckhammer Chamber And Cartridge Dimensions
The relationship between the 360 Buckhammer cartridge and the firearm chamber is critical for reliable functionality in lever action rifles. Because it lacks a bottleneck shoulder, the 360 Buckhammer cartridge relies heavily on its rim. The cartridge headspaces on its 0.506 inch rim.
This means the front face of the brass rim physically stops against a machined ledge at the rear of the barrel chamber. Proper case length and crimping are absolutely mandatory. Reloaders must apply a firm crimp to ensure the bullet does not push deeper into the case under the heavy spring tension and recoil forces present in a tubular magazine.
360 Buckhammer Dimensions vs Similar Cartridges
To understand the 360 Buckhammer size profile, it is helpful to compare it against other popular straight walled and lever action rifle cartridges.
| Cartridge | Bullet Diameter | Case Length | Overall Length | Rim / Base Diameter | Maximum Pressure | Source |
| 360 Buckhammer | 0.358 in | 1.800 in | 2.500 in | 0.506 in / 0.419 in | 50,000 psi | SAAMI |
| 350 Legend | 0.357 in | 1.710 in | 2.260 in | 0.378 in / 0.390 in | 55,000 psi | SAAMI |
| 30-30 Winchester | 0.308 in | 2.039 in | 2.550 in | 0.506 in / 0.422 in | 42,000 psi | SAAMI |
| 450 Bushmaster | 0.452 in | 1.700 in | 2.260 in | 0.473 in / 0.500 in | 38,500 psi | SAAMI |
| 400 Legend | 0.400 in | 1.650 in | 2.260 in | 0.422 in / 0.422 in | 45,000 psi | SAAMI |
360 Buckhammer vs 350 Legend Dimensions
Because they occupy the same straight walled hunting market, the 360 Buckhammer and the 350 Legend are frequently compared, but their physical dimensions dictate entirely different firearm platforms.
- Bullet Diameter:The 360 Buckhammer utilizes a true 0.358 inch rifle bullet.The 350 Legend uses a slightly narrower 0.357 inch bullet (often loaded with 0.355 inch projectiles).
- Case and Rim Design:The 360 Buckhammer is a rimmed cartridge designed explicitly for tubular magazine lever action rifles. The 350 Legend is a rimless cartridge with a 0.378 inch rebated rim designed to fit seamlessly into standard AR-15 bolt carriers and box magazines.
- Overall Length:The 360 Buckhammer has a much longer 2.500 inch maximum OAL compared to the 2.260 inch limit of the 350 Legend.
Dimensional similarity in bullet diameter does not mean ammunition interchangeability. Attempting to fire a 350 Legend in a 360 Buckhammer rifle, or vice versa, is physically impossible due to the drastic differences in rim design, case width, and overall length.
360 Buckhammer SAAMI vs C.I.P. Dimensions
Cartridge dimensions and safe pressure limits are strictly governed by SAAMI in the United States. Remington developed the cartridge and submitted it to SAAMI, which accepted and standardized the 360 Buckhammer in early 2023.
SAAMI lists the maximum average pressure for the 360 Buckhammer at 50,000 psi, measured via conformal piezoelectric transducers. The European C.I.P. does not instantly adopt highly specialized American hunting cartridges, meaning C.I.P. specifications may not be immediately available. However, any ammunition manufactured to the official SAAMI specifications is considered safe and standard for use in properly chambered firearms globally.
360 Buckhammer Bullet Weight And Dimensions
The 360 Buckhammer was optimized entirely around standard hunting weights in the 35 caliber spectrum. Common factory bullet weights include:
- 180 grain:A shorter, lighter hunting bullet that sits perfectly in the 1.800 inch case, delivering excellent velocities (roughly 2,400 feet per second) for flat shooting on medium game.
- 200 grain: The heavier traditional standard. These longer bullets take up more space inside the brass case and provide excellent momentum and deep penetration for larger game.
Bullet weight does not alter the standardized external brass case dimensions, but the manufacturer must carefully manage bullet seating depth to ensure the loaded round stays within the 2.500 inch length limit required for smooth cycling in lever actions.
Why 360 Buckhammer Dimensions Matter
Understanding the specific 360 Buckhammer measurements is essential for several practical reasons.
- Hunting Regulations: The 1.800 inch case length was specifically engineered to comply with strict state hunting laws that cap straight walled cartridges at a maximum case length of 1.800 inches.
- Parts Compatibility: Because the 0.506 inch rim diameter is identical to the 30-30 Winchester, firearms manufacturers can easily adapt existing 30-30 lever action rifle designs to safely chamber and extract the new cartridge.
- Reloading Safety: Because the cartridge is used in tubular magazines, reloaders must meticulously crimp their ammunition. Cases trimmed inconsistently will result in a weak crimp, allowing the bullet to push back into the case under recoil, which can cause severe pressure spikes upon firing.
Manufacturer Specifications vs Independent Measurements
If you use precision calipers to measure factory 360 Buckhammer ammunition from companies like Remington or Federal, the numbers will rarely match the SAAMI maximum specifications exactly.
SAAMI publishes maximum allowable dimensions to ensure absolute safety and interoperability across all firearm brands. Ammunition manufacturers purposefully produce their cases slightly smaller than these maximums. For example, the maximum case length is 1.800 inches, but measuring a factory cartridge might reveal a case length of 1.790 inches. This built in negative tolerance margin guarantees that the ammunition will chamber smoothly in the field, even if the rifle chamber is fouled from carbon buildup during extended hunting trips.
Common Questions
What are the dimensions of the 360 Buckhammer?
The key maximum dimensions are a bullet diameter of 0.358 inches, a case length of 1.800 inches, and an overall cartridge length of 2.500 inches.
What is the 360 Buckhammer case length?
The maximum SAAMI case length is exactly 1.800 inches (45.72 mm).
What is the 360 Buckhammer overall length?
The maximum overall length (OAL) is 2.500 inches (63.50 mm), designed to fit standard lever action rifles.
What is the 360 Buckhammer bullet diameter?
The SAAMI maximum bullet diameter is 0.358 inches.
What is the 360 Buckhammer rim diameter?
The rim diameter measures 0.506 inches, perfectly matching the 30-30 Winchester parent case.
What is the 360 Buckhammer case diameter?
The case diameter at the base is 0.4195 inches, tapering slightly to 0.3798 inches at the case mouth.
What is the maximum pressure for the 360 Buckhammer?
The SAAMI maximum average pressure is strictly capped at 50,000 psi.
How do 360 Buckhammer and 350 Legend dimensions compare?
The 360 Buckhammer is a rimmed cartridge built for lever actions, utilizing a 1.800 inch case and a 0.358 inch bullet. The 350 Legend is a rimless cartridge built for AR-15s, utilizing a shorter 1.710 inch case and a slightly narrower 0.357 inch bullet.
Does the 360 Buckhammer use a 30-30 Winchester case?
The cartridge is based heavily on the 30-30 Winchester, utilizing the same rim diameter, but it blows the case out to a straight wall taper and trims it down to a 1.800 inch length.