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.577/.500 Magnum Nitro Express
Type Rifle
Place of origin UK
Bullet diameter .500 in (Bad rounding hereScript error mm)
Neck diameter .526 in (Bad rounding hereScript error mm)
Shoulder diameter .585 in (Bad rounding hereScript error mm)
Base diameter .645 in (Bad rounding hereScript error mm)
Rim diameter .717 in (Bad rounding hereScript error mm)
Case length 3.13 in (Bad rounding hereScript error mm)
Overall length 3.74 in (Bad rounding hereScript error mm)
Rifling twist 1:16
Primer type .251 (6.38 mm) Berdan (Kynoch #31A)
Ballistic performance
Bullet weight/type Velocity Energy
440 gr (Bad rounding hereScript error g) (factory load)1,725 ft/s (Bad rounding hereScript error m/s)2,920 ft·lbf (Bad rounding hereScript error J)
Source(s): Barnes & Amber 1972

The .577/.500 Magnum Nitro Express is a British centerfire fire rifle cartridge.

Designed as a black powder round in the mid-1880s, it was based on the .577 Nitro Express, necked down to .500" (12.7mm),[1] and was later offered in a smokeless version.[1] While it resembles the .500 No. 2 Express, they are not the same.[1]

In power, the .577/.500 is comparable to the contemporary .50-110 Winchester, or the modern .30-'06.[2] It is sufficient for elk, deer, moose, or bear at medium range or in woods[1] and thin-skinned dangerous game, including tiger and lions,[3] but not thick skinned ones such as the rhinoceros. It was favored more in India than Africa by contemporary shooters, and tended to be offered in heavy rifles.[4]

Moderately popular in its day, the round has long since ceased to be offered commercially. Black powder rifles in this caliber should not use heavy smokeless loads.[1]

See alsoEdit


  1. 1.0 1.1 1.2 1.3 1.4 Barnes, p.230, ".577/.500 Magnum Nitro Express".
  2. Barnes, p.230, ".577/.500 Magnum Nitro Express", & p.39.
  3. Barnes, p.230, ".500 No. 2 Express (.577/.500)".
  4. Barnes, p.233, ".577 Nitro-Express".


  • Barnes, Frank C., ed. by John T. Amber. ".577/500 Magnum Nitro Express", in Cartridges of the World, pp. 230 & 236. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.
  • ______ and _____. ".30-06 Springfield", in Cartridges of the World, p. 39. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.
  • ______ and _____. ".577 Nitro-Express", in Cartridges of the World, p. 233. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.
  • ______ and _____. ".500 No. 2 Express (.577/.500)", in Cartridges of the World, p. 230. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.

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