| 词条 | .700 Nitro Express |
| 释义 |
| name = .700 Nitro Express | image = 700ne.png | caption = .700 Nitro Express cartridge | origin = United Kingdom | type = Big Game Rifle | service = | used_by = | wars = | designer = Jim Bell / William Feldstein | design_date = 1988 | manufacturer = H&H | production_date = 1988 | number = | variants = | is_SI_specs = | parent = None | case_type = Rimmed, straight[1] | bullet = .700 | neck = .730 | shoulder = | base = .780 | rim_dia = .890 | rim_thick = .060 | case_length = 3.50 | length = 4.20 | case_capacity = 316.9 | rifling = | primer = Boxer; Magnum Large Rifle | is_SI_ballistics = | bw1 = 1000 | btype1 = SP | vel1 = 2000 | en1 = 8900 | bw2 = | btype2 = | vel2 = | en2 = | bw3 = | btype3 = | vel3 = | en3 = | bw4 = | btype4 = | vel4 = | en4 = | bw5 = | btype5 = | vel5 = | en5 = | test_barrel_length = | balsrc = Kynoch [1] }} The .700 Nitro Express (17.8×89mmR) is a big game rifle cartridge made by Holland & Holland, London, England. It was developed in 1988 by Jim Bell and William Feldstein and built by H&H. Feldstein had tried unsuccessfully to get H&H to build a .600 Nitro Express for him, but they had already ceased production. However, when Bell and Feldstein produced the entirely new .700 Nitro Express cartridge, they were able to attract the interest of H&H, which was looking for a new big-bore cartridge. After production began, the backlog of orders was so great that it continued to 2007 and H&H restarted the production of .600 Nitro Express guns.[2] SpecificationsIn many respects this cartridge parallels the .600 Nitro Express. It is essentially a scaled-up version of that cartridge, but is somewhat more powerful, and fires a heavier 1000-grain (64.8 g) bullet. The case itself is a completely new case, not simply another case resized. Double rifles are extremely expensive, starting at about $10,000 and selling upwards of $260,000 USD in 2015, and have generally been replaced by repeater-rifles using rounds such as the .458 Winchester. Single factory loaded .700 Nitro cartridges are available, typically at $100 USD each, although they have been sold on the internet for as little as $50 USD. .700 Nitro cases, like those of other big bore cartridges, can be hand reloaded, drastically reducing the cost. BallisticsThe .700 Nitro Express develops an approximate average of {{convert|8900|ftlbf|J}} of muzzle energy with a {{convert|1000|gr|abbr=on}} bullet at {{convert|2000|ft/s|m/s|0|abbr=on}}. However handloaders can push the cartridge to generate as much as {{convert|15000|ftlb|J}} of energy in a modern bolt action, by using a {{convert|1000|gr|abbr=on}} bullet fired at {{convert|2600|ft/s|m/s|0|abbr=on}}. However, doing so necessitates a rifle so heavy it is almost inoperable for hunting purposes. Lathe turned cases as used in the Accurate Reloading rifle above will suffer blown primers at this level though a good source of drawn brass would allow (in theory) velocities up to {{convert|2700|ft/s|abbr=on}}. The typical average muzzle velocity of a factory-loaded cartridge is {{convert|2000|ft/s|m/s|0|abbr=on}}. In the {{convert|18|lb|adj=on}} rifle used by Accurate Reloading this would result in recoil energy of approximately {{convert|160|ftlbf|J|abbr=on}}. This is more than ten times the average recoil from a .308 Winchester which is a very common hunting calibre, and more than 4 times the recoil of a strong .45-70 Government round. Comparable calibersRifle calibers comparable to the .700 Nitro Express in terms of power and recoil include the following:
See also
References
External links{{Commons category|Cartridge dimensions}}
3 : Pistol and rifle cartridges|British firearm cartridges|Holland & Holland cartridges |
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