What characterises .300 Norma Magnum?
.300 Norma Magnum is a distinct Magnum cartridge in the .30 group. Its design is related to .338 Norma Magnum but uses a smaller bullet diameter. It is neither .300 Winchester Magnum nor the older .308 Norma Magnum. “NM” alone is therefore not an unambiguous name.
.300 Norma Magnum is a distinct Magnum cartridge in the .30 group. Its design is related to .338 Norma Magnum but uses a smaller bullet diameter. It is neither .300 Winchester Magnum nor the older .308 Norma Magnum. “NM” alone is therefore not an unambiguous name.
The cartridge appears in long-range and precision shooting. Different ammunition versions share the designation. Bullet construction and mass affect their characteristics, so velocity and energy figures apply to the named version and documented test conditions.
The data section gives dimensions and sources. Overall cartridge length includes the case and bullet, while case length measures only the case. A quoted range is not a fixed property of every cartridge with this name. Eligibility at a range or in a competition class depends on the applicable rules.
.300 Norma Magnum — Dimensions, energy and range
- A · Overall cartridge length: 93.50 mm
- B · Case length: 63.30 mm
- C · Bullet diameter: 7.83 mm
Dimensions are taken from the table. Shape and proportions are simplified; the exposed bullet tip varies with the load. Not a scale standard or manufacturing drawing.
Drawing: Weitschuss
- Case length
- 63.30 mm
- Bullet diameter
- 7.83 mm
- Overall cartridge length
- 93.50 mm
- Muzzle energy E₀
- 5971 J (source example)
- Range context
- No sufficiently qualified range figure was taken from the reviewed sources.
What the dimensions mean
Case length measures the case without the bullet; overall length measures the complete cartridge. Bullet diameter is distinct from bore calibre. Sources may give nominal or maximum dimensions, so rounded figures can differ slightly. This overview is not a dimensioned standard drawing and does not establish interchangeability.
Understanding energy
E₀ is kinetic energy at the muzzle. It depends on bullet mass and velocity. These figures refer to selected examples from the sources, not every load of this calibre. Bullet design, barrel length and test conditions affect the result. A range of examples is neither a complete market comparison nor guaranteed minimum and maximum performance.
Understanding range
A sporting application distance describes a use case. Supersonic range is the distance over which a particular bullet remains faster than sound under specified conditions. Both differ from maximum flight distance. The cartridge name alone cannot provide a reliable range limit without load and condition details. These distances are neither hunting recommendations nor safety distances.
Data sources: Wikipedia · Source check 2026-10-04