What characterises .300 Winchester Magnum?
.300 Winchester Magnum is a widely used Magnum cartridge in the .30 group, found in sport, hunting and professional service. A belt around the case is one of its external features. .300 Norma Magnum and .300 PRC are different cartridges, not alternative names for the same design.
.300 Winchester Magnum is a widely used Magnum cartridge in the .30 group, found in sport, hunting and professional service. A belt around the case is one of its external features. .300 Norma Magnum and .300 PRC are different cartridges, not alternative names for the same design.
An ammunition version is also called a load. Different .300 Winchester Magnum loads use different bullets, so performance figures belong to the specified ammunition and test conditions. The name establishes neither a fixed range nor a guaranteed group size.
The drawing and data section explain dimensions. Case length measures only the case; overall length measures the complete cartridge. Energy figures are examples from the cited sources. Competition entry also depends on the available class and the range’s approval.
.300 Winchester Magnum — Dimensions, energy and range
- A · Overall cartridge length: 84.84 mm
- B · Case length: 66.55 mm
- C · Bullet diameter: 7.82 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
- 66.55 mm
- Bullet diameter
- 7.82 mm
- Overall cartridge length
- 84.84 mm
- Muzzle energy E₀
- 4919–5600 J (source examples)
- Range context
- No sufficiently qualified range figure was taken from the reviewed sources.
Source dimensions in inches converted to millimetres and rounded.
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