The 28 Nosler cartridge features a standard bullet diameter of 0.284 inches (7.21 mm) and a maximum case length of 2.590 inches (65.8 mm).
The maximum overall cartridge length (COAL) is standardized at 3.340 inches (84.8 mm) to fit standard-length rifle actions.
Its lower anatomy incorporates a rebated rim diameter of 0.534 inches (13.6 mm) and a maximum base diameter of 0.550 inches (14.0 mm).
Moving upward, the case features a shoulder diameter of approximately 0.528 inches (13.4 mm) and a neck diameter of 0.320 inches (8.1 mm).
Published specifications reflect nominal targets, maximum envelope limits, or allowable manufacturing tolerances defined by SAAMI and Nosler.
Reviewing these core geometrical figures is essential for evaluating case capacity, chamber clearance, and safe ballistic performance.
28 Nosler Dimensions
| Dimension | Inches | Millimeters | Specification Type | Source | Notes |
| Bullet Diameter | 0.284 in | 7.21 mm | Nominal | SAAMI / Nosler | Standard 7mm caliber (.284) projectile standard |
| Case Length | 2.590 in | 65.8 mm | Maximum | SAAMI / Nosler | Maximum allowable length from case head to mouth |
| Overall Cartridge Length | 3.340 in | 84.8 mm | Maximum (COAL) | SAAMI / Nosler | Designed to fit standard length rifle actions |
| Rim Diameter | 0.534 in | 13.6 mm | Maximum | SAAMI / Nosler | Rebated rim configuration |
| Base Diameter | 0.550 in | 14.0 mm | Maximum | SAAMI / Nosler | Body diameter just forward of the extractor groove |
| Shoulder Diameter | 0.528 in | 13.4 mm | Nominal / Max | SAAMI / Nosler | Measured at the junction of the shoulder and body |
| Neck Diameter | 0.320 in | 8.1 mm | Maximum | SAAMI / Nosler | Dimension at the case neck for loaded round clearance |
| Shoulder Angle | 35.0° | 35.0° | Nominal | SAAMI / Nosler | Sharp 35-degree shoulder geometry |
| Case Capacity | 93.8 gr H₂O | 6.08 ml | Measured / Nominal Usable | Nosler / SAAMI | Usable water capacity to the mouth |
| Maximum Pressure | 65,000 psi | 450 MPa | Maximum Average Pressure (MAP) | SAAMI | Upper pressure safety threshold |
Understanding The 28 Nosler Dimensions
Analyzing the 28 Nosler cartridge dimensions requires breaking down how each measurement contributes to external and internal ballistics. The bullet diameter defines the projectile size (.284 inches), which dictates how it engages the rifling lands and grooves.The case length (2.590 inches) measures the distance from the base of the cartridge to the mouth, establishing the volume available for propellant.The rebated rim diameter (0.534 inches) and base diameter (0.550 inches) permit the cartridge to generate ultra-magnum performance while utilizing standard-sized bolt faces and shorter receiver throws.
The shoulder diameter and shoulder angle (35 degrees) provide a positive headspacing reference point, locking the cartridge securely into the chamber while enhancing ignition uniformity.The neck length and neck diameter (0.320 inches) ensure consistent bullet grip and tension without inducing excessive neck-wall thickness variations.Finally, the overall cartridge length (COAL) of 3.340 inches dictates magazine compatibility, ensuring that high-performance, high-ballistic-coefficient (BC) bullets can be housed in standard-length rifle actions rather than oversized magnum actions.
28 Nosler Dimensions In Inches And Millimeters
To accommodate both imperial and metric reloaders and technicians, standard 28 Nosler cartridge dimensions are presented below in both inches and millimeters.
| Parameter | Inches (in) | Millimeters (mm) |
| Bullet Diameter | 0.284 in | 7.21 mm |
| Case Length (Max) | 2.590 in | 65.8 mm |
| Cartridge Overall Length (Max) | 3.340 in | 84.8 mm |
| Base Diameter | 0.550 in | 14.0 mm |
| Rim Diameter | 0.534 in | 13.6 mm |
| Shoulder Diameter | 0.528 in | 13.4 mm |
| Neck Diameter | 0.320 in | 8.1 mm |
28 Nosler Case Dimensions
The 28 Nosler case dimensions are engineered to maximize powder volume while maintaining structural integrity under high chamber pressures. Derived from the .300 Remington Ultra Magnum (RUM) parent case, the 28 Nosler case length is trimmed to a maximum of 2.590 inches, featuring a stout base diameter of 0.550 inches and a rebated rim of 0.534 inches.
The body tapers gently up to a sharp 35-degree shoulder angle, terminating in a neck designed specifically for 7mm (.284-inch) projectiles. Nominal dimensions provided by SAAMI represent blueprint targets, whereas manufactured brass will always feature tight, allowable manufacturing tolerances to ensure uniform wall thickness and concentricity.
28 Nosler Bullet Diameter
The official 28 Nosler bullet diameter is standardized at exactly 0.284 inches (7.21 mm). This diameter defines the 7mm caliber classification. It is crucial to distinguish bullet diameter from bore and groove dimensions: the bore diameter refers to the interior span across the raised rifling lands, while the groove diameter measures the deeper valley-to-valley span of the rifling. The bullet diameter is engineered to match or slightly exceed the groove diameter to ensure a tight gas seal upon firing. Common 7mm bullet sizes share this 0.284-inch designation, but their overall lengths and ogive profiles vary significantly.
28 Nosler Overall Cartridge Length
The published maximum overall length (COAL) for the 28 Nosler is 3.340 inches (84.8 mm).This dimension is a defining characteristic of the cartridge family, as it allows magnum-level velocity to be achieved in standard-length rifle actions (such as the .30-06 Springfield footprint).
However, actual loaded-cartridge length can vary depending on the specific bullet design. Heavy, high-BC long-range bullets often possess longer ogives, meaning handloaders may seat them further out or deeper depending on chamber throat geometry, provided the final round still cycles safely through the firearm’s internal magazine box.
28 Nosler Case Capacity
The 28 Nosler case capacity is reliably documented at approximately 93.8 grains of water (6.08 ml) when filled to the mouth. This substantial internal volume is what enables the cartridge to propel heavy 7mm projectiles at ultra-high velocities.
However, capacity can vary noticeably between different brass manufacturers due to internal wall thickness variations and manufacturing lot tolerances. Nominal published capacity serves as a baseline, but actual measured capacity dictates how internal ballistics and powder burn rates behave. Consequently, case capacity figures from distinct brass brands should be verified rather than treated as identical.
28 Nosler Dimensions vs Similar Cartridges
Comparing the 28 Nosler with other prominent 7mm magnum options highlights its unique design philosophy, balancing compact action length with massive powder capacity.
| Cartridge | Bullet Diameter | Case Length | Overall Length | Rim / Base Diameter | Case Capacity | Source |
| 28 Nosler | 0.284 in | 2.590 in | 3.340 in | Rim: 0.534 in / Base: 0.550 in | 93.8 gr H₂O | SAAMI / Nosler |
| 7mm Remington Magnum | 0.284 in | 2.500 in | 3.290 in | 0.532 in (Belted) | ~82.7 gr H₂O | SAAMI |
| 7mm PRC | 0.284 in | 2.580 in (Max case) / 2.280 in | 3.340 in | 0.532 in | ~80.4 gr H₂O | SAAMI |
| 7mm Weatherby Magnum | 0.284 in | 2.525 in | 3.625 in | 0.536 in (Belted) | ~84.0 gr H₂O | SAAMI |
| 26 Nosler | 0.264 in | 2.590 in | 3.340 in | Rim: 0.534 in / Base: 0.550 in | ~93.0 gr H₂O | SAAMI / Nosler |
28 Nosler vs 7mm PRC Dimensions
Both the 28 Nosler and the 7mm PRC are modern, beltless 7mm cartridges designed for long-range efficiency, but their dimensional profiles differ substantially.The 28 Nosler features a longer case length (2.590 inches vs. 2.280 inches for the 7mm PRC) and a wider base diameter (0.550 inches vs. 0.532 inches), yielding significantly greater case capacity (~93.8 grains vs. ~80.4 grains of water).
Both share the same maximum overall cartridge length of 3.340 inches to fit standard-length actions, and both utilize a 0.284-inch bullet diameter.However, the 7mm PRC is purposely engineered with a shorter case body to allow ultra-heavy, long-ogive bullets to be seated outward without intruding into the powder column, whereas the 28 Nosler relies on raw case volume to drive bullets at higher initial velocities.
28 Nosler vs 7mm Remington Magnum Dimensions
When evaluating the 28 Nosler cartridge size against the classic 7mm Remington Magnum, distinct design divergences emerge.The 7mm Remington Magnum utilizes a belted case design with a rim and base diameter of 0.532 inches and a case length of 2.500 inches.In contrast, the 28 Nosler is beltless, features a wider base diameter of 0.550 inches, a rebated rim of 0.534 inches, and a slightly longer case length of 2.590 inches.
The 28 Nosler incorporates a sharper 35-degree shoulder angle compared to the 26-degree shoulder of the Remington Magnum.While both share a standard bullet diameter of 0.284 inches and a similar maximum overall length (~3.30 to 3.34 inches), the 28 Nosler’s beltless, blown-out case provides noticeably higher powder capacity, translating to faster muzzle velocities. Dimensional similarity in caliber does not make them interchangeable.
28 Nosler Chamber And Cartridge Dimensions
Cartridge dimensions dictate how a round interfaces with the firearm’s chamber. In the 28 Nosler, proper headspacing relies on the 35-degree shoulder datum rather than a belt.The chamber throat is cut with a specific leade to support long, high-BC projectiles, ensuring correct alignment with the bore centerline. The case neck and body dimensions of the chamber provide minimal clearance over maximum cartridge dimensions to prevent excessive brass expansion while ensuring reliable chambering and extraction under field conditions.
28 Nosler Bullet Weight And Dimensions
The 28 Nosler accommodates a broad spectrum of bullet weights, ranging from 150 grains up to 180+ grains, encompassing popular options like 150, 160, 162, 168, and 175-grain configurations.
While bullet weight does not alter standardized case dimensions, projectile shape, length, and ogive profile directly influence how the bullet is seated relative to the case mouth and overall cartridge length. Heavy-for-class bullets feature longer bearing surfaces that extend deeper into the neck, making overall length management critical for magazine feeding.
Why 28 Nosler Dimensions Matter
The precise dimensions of the 28 Nosler govern every facet of its operational utility:
- Chamber Fit & Headspacing: Ensures the cartridge indexes correctly on the shoulder datum for safe ignition.
- Feeding & Magazine Compatibility:The 3.340-inch COAL allows flawless operation in standard-length rifle actions.
- Pressure Management: Strict adherence to case volume and wall tolerances keeps chamber pressures at or below the 65,000 psi SAAMI limit.
- Bullet Selection & Reloading: Dimensional clarity aids in selecting proper seating depths, preventing excessive freebore jump or over-pressurization.
Manufacturer Specifications vs Independent Measurements
Official dimensional data for the 28 Nosler is governed by standards organizations such as SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) and proprietary documentation from Nosler. While SAAMI and manufacturer specifications establish the maximum design envelopes and pressure ceilings (65,000 psi), independent measurements of factory ammunition or fired brass may show minor variances.
Actual factory cartridges and fired cases typically measure slightly smaller than maximum SAAMI chamber dimensions to allow smooth functioning across mass-produced firearms. Official standards remain the primary reference point for cartridge geometry.
Common Questions
What are the dimensions of 28 Nosler?
The 28 Nosler has a bullet diameter of 0.284 inches, a maximum case length of 2.590 inches, a maximum overall cartridge length of 3.340 inches, a base diameter of 0.550 inches, and a rebated rim diameter of 0.534 inches.
What is the 28 Nosler case length?
The maximum SAAMI case length for the 28 Nosler is 2.590 inches (65.8 mm).
What is the 28 Nosler overall length?
The maximum overall cartridge length (COAL) is 3.340 inches (84.8 mm).
What is the 28 Nosler bullet diameter?
The standardized bullet diameter is 0.284 inches (7.21 mm).
What is the 28 Nosler rim diameter?
The rim diameter is 0.534 inches (13.6 mm) in a rebated configuration.
What is the 28 Nosler base diameter?
The maximum base diameter is 0.550 inches (14.0 mm).
What is the 28 Nosler case diameter?
The main body/base diameter measures 0.550 inches maximum.
What is the 28 Nosler case capacity?
The usable case capacity is approximately 93.8 grains of water (6.08 ml).
How does 28 Nosler compare with 7mm PRC dimensions?
While both share a 0.284-inch bullet diameter and a 3.340-inch maximum overall length, the 28 Nosler features a longer case (2.590 in vs. 2.280 in) and wider base (0.550 in vs. 0.532 in), providing greater powder capacity.
How does 28 Nosler compare with 7mm Remington Magnum dimensions?
The 28 Nosler is beltless with a 0.550-inch base and 0.534-inch rebated rim, whereas the 7mm Remington Magnum utilizes a belted case with a 0.532-inch diameter.
Is 28 Nosler the same size as 7mm PRC?
No. Although both fit standard-length actions and fire 7mm bullets, their case lengths, base diameters, and internal volumes differ.
What is the maximum overall length of 28 Nosler?
The maximum SAAMI overall length is 3.340 inches.
What is the 28 Nosler maximum pressure?
The SAAMI Maximum Average Pressure (MAP) limit is 65,000 psi (450 MPa).
Final Verdict
The 28 Nosler is defined by its 0.284-inch bullet diameter, 2.590-inch case length, and 3.340-inch maximum overall length, packaged with a 0.550-inch base and 0.534-inch rebated rim to fit standard-length actions.Compared to traditional belted magnums and modern options like the 7mm PRC, it delivers superior case capacity while maintaining standard-action compatibility. Understanding its shoulder geometry, case capacity, and strict SAAMI dimensions is vital for maximizing its exceptional long-range ballistics safely.