What characterises .50 BMG?
.50 BMG is also called 12.7 × 99 mm. It is known from military contexts and also appears in specialised large-calibre sporting and ELR systems. Not every cartridge with “.50” in its name is .50 BMG, however. A large precision rifle cannot be identified by appearance alone either.
.50 BMG is also called 12.7 × 99 mm. It is known from military contexts and also appears in specialised large-calibre sporting and ELR systems. Not every cartridge with “.50” in its name is .50 BMG, however. A large precision rifle cannot be identified by appearance alone either.
Different ammunition versions share this cartridge designation. Bullet design and mass therefore belong in every specific description. An energy or velocity figure applies to the named version under the stated conditions. The name alone guarantees neither a particular range nor a particular precision level.
The data section provides external dimensions and sourced performance examples. Case length is shorter than overall cartridge length because the latter includes the exposed part of the bullet. Sporting eligibility and range access are separate questions, governed by the event announcement, class and range conditions.
.50 BMG — Dimensions, energy and range
- A · Overall cartridge length: 138.43 mm
- B · Case length: 99.31 mm
- C · Bullet diameter: 12.98 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
- 99.31 mm
- Bullet diameter
- 12.98 mm
- Overall cartridge length
- 138.43 mm
- Muzzle energy E₀
- 17952–18942 J (source examples)
- 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