.240 Apex
{{Short description|UK sporting rifle cartridge}}
{{Notability|Product|date=February 2022}}
{{Infobox Firearm Cartridge
|name= .240 Magnum Rimless
|image=
|caption=
|origin= England
|type= Rifle
|service=
|used_by=
|wars=
|designer= Holland & Holland
|design_date=1919
|manufacturer=Holland & Holland
|production_date=
|number=
|variants=
|is_SI_specs=
|parent=
|case_type=Belted, bottleneck
|bullet=.245
|neck=.274
|shoulder=.403
|base=.450
|rim_dia=.467
|rim_thick=.035
|case_length=2.49
|length=3.21
|rifling=
|primer=Kynoch # 81
|is_SI_ballistics=
|bw1=100
|btype1=SP
|vel1=2900
|en1=1865
|bw2=
|btype2=
|vel2=
|en2=
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|balsrc= Cartridges of the World.Barnes, Frank C., Cartridges of the World, 15th ed, Gun Digest Books, Iola, 2016, {{ISBN|978-1-4402-4642-5}}.
}}
{{Infobox Firearm Cartridge
|name= .240 Magnum Flanged
|image=
|caption=
|origin=
|type=
|service=
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|designer=
|design_date=
|manufacturer=
|production_date=
|number=
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|parent=
|case_type=Rimmed, bottleneck
|bullet=.245
|neck=.274
|shoulder=.402
|base=.448
|rim_dia=.513
|rim_thick=UNK
|case_length=2.5
|length=3.25
|rifling=
|primer=Kynoch # 81
|is_SI_ballistics=
|bw1=100
|btype1=SN
|vel1=2775
|en1=1711
|bw2=
|btype2=
|vel2=
|en2=
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|test_barrel_length=28
|balsrc= Kynoch[http://www.kynochammunition.co.uk/cartridge%20collection.html Kynoch Ammunition, "Big Game Cartridges", www.kynochammunition.co.uk], [https://web.archive.org/web/20150527033406/http://www.kynochammunition.co.uk/cartridge%20collection.html archived], 15 August 2016.
}}
The .240 Magnum Rimless Holland & Holland (also known as the .240 Apex and the .240 Super Express) is a centrefire sporting rifle cartridge developed in English gunmakers Holland & Holland no later than 1919,{{Cite web | url=https://digitalcollections.nypl.org/items/510d47e2-cdda-a3d9-e040-e00a18064a99 | title=Holland & Hollands "Apex" .240 super express rifle }} primarily for use in hunting deer and plains game.
As it was common for rimless hunting cartridges, a rimmed (beltless) variant, at the time called just "Holland's 240 Super Express"[https://dspace.nplg.gov.ge/handle/1234/84132 H&H 1933 catalog] and now sometimes named .240 Flanged Magnum or .240 H&H Flanged, was developed simultaneously for break-barrel rifles and combination guns.{{Cite web | url=https://www.cartridgecollector.net/240-flanged-magnum | title=240 FLANGED MAGNUM | Cartridgecollector.net }}
Overview
The ballistic performance of the .240 H&H in factory loads is very similar to that of the .243 Winchester, with a {{convert|100|gr|g|adj=on}} bullet with a diameter of .245 inches (contrary to the .240 name) giving a muzzle velocity of approximately {{convert|2900|ft/s|m/s}}. When it is loaded at the same pressure as the .243 WSSM using modern powders, the .240 H&H has the potential for slightly better performance.
Most bolt-action rifles made for the .240 H&H will be amply strong enough to handle hand-loaded cartridges at high pressure.
| class="wikitable sortable" style="margin:auto;"
|+.240 H&H Performance Comparison ! Cartridge !! Bullet weight !! Muzzle velocity !! Muzzle energy | |||
| .240 H&H Magnum | {{convert|100|gr|g|abbr=on}} | {{convert|2900|ft/s|m/s|abbr=on}} | {{convert|1865|ft·lbf|J|abbr=on}} |
| .240 Weatherby Magnum | {{convert|100|gr|g|abbr=on}} | {{convert|3406|ft/s|m/s|abbr=on}} | {{convert|2576|ft·lbf|J|abbr=on}} |
| .242 Rimless Nitro Express | {{convert|100|gr|g|abbr=on}} | {{convert|2800|ft/s|m/s|abbr=on}} | {{convert|1740|ft·lbf|J|abbr=on}} |
| .243 Winchester | {{convert|100|gr|g|abbr=on}} | {{convert|2960|ft/s|m/s|abbr=on}} | {{convert|1945|ft·lbf|J|abbr=on}} |
| .243 Winchester Super Short Magnum | {{convert|100|gr|g|abbr=on}} | {{convert|3110|ft/s|m/s|abbr=on}} | {{convert|2147|ft·lbf|J|abbr=on}} |
| .244 H&H Magnum | {{convert|100|gr|g|abbr=on}} | {{convert|3500|ft/s|m/s|abbr=on}} | {{convert|2720|ft·lbf|J|abbr=on}} |
| .246 Purdey | {{convert|100|gr|g|abbr=on}} | {{convert|2950|ft/s|m/s|abbr=on}} | {{convert|1930|ft·lbf|J|abbr=on}} |
| 6 mm Lee Navy | {{convert|100|gr|g|abbr=on}} | {{convert|2680|ft/s|m/s|abbr=on}} | {{convert|1595|ft·lbf|J|abbr=on}} |
| 6 mm Remington | {{convert|100|gr|g|abbr=on}} | {{convert|3100|ft/s|m/s|abbr=on}} | {{convert|2133|ft·lbf|J|abbr=on}} |
See also
References
{{reflist}}
{{DEFAULTSORT:240 HandH Magnum}}
Category:Pistol and rifle cartridges
Category:Magnum rifle cartridges