.242 Rimless Nitro Express

{{Short description|UK centerfire rifle cartridge}}

{{Notability|Product|date=February 2022}}

{{Infobox Firearm Cartridge

|name= .242 Rimless Nitro Express

|image=

|caption=

|origin= United Kingdom

|type= Rifle

|designer= Kynoch

|design_date=1923

|manufacturer=

|production_date=1923–present

|number=

|variants=

|is_SI_specs=

|parent=

|case_type=Rimless, bottleneck

|bullet=.253

|neck=.281

|shoulder=.405

|base=.465

|rim_dia=.465

|rim_thick=

|case_length=2.38

|length=3.2

|rifling=

|primer=.217/54

|is_SI_ballistics=

|bw1=100

|btype1=

|vel1=2800

|en1=1740

|bw2=

|btype2=

|vel2=

|en2=

|bw3=

|btype3=

|vel3=

|en3=

|test_barrel_length=

|balsrc=Cartridges of the World.{{r|Barnes}}

}}

The .242 Rimless Nitro Express, also known as the .242 Vickers and initially called the .242 Manton, was a rimless bottleneck centerfire rifle cartridge developed by Kynoch for J. Manton & Co of Calcutta and introduced in 1923.{{r|Barnes|IWM}}

The .242 Rimless is very similar to the .243 Winchester in performance, although the cartridge is significantly longer. It fired a 100 gr projectile at 2800 fps.{{r|Barnes|IWM}}

class="wikitable sortable" style="margin:auto;" |+.242 Vickers Performance Comparison ! Cartridge !! Bullet weight !! Muzzle velocity !! Muzzle energy
.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}}
.240 Apex	{{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}}
.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}}