.20 BR: Difference between revisions

.20 BR
.20 BR
Type	Rifle
Place of origin	USA
Specifications
Parent case	.22 BR
Bullet diameter	.204 in (5.2 mm)
Neck diameter	.232 in (5.9 mm)
Shoulder diameter	.459 in (11.7 mm)
Base diameter	.470 in (11.9 mm)
Rim diameter	.473 in (12.0 mm)
Rim thickness	.054 in (1.4 mm)
Case length	1.56 in (40 mm)
Primer type	small rifle
Ballistic performance
	Source(s): 6mmbr.com

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Revision as of 04:13, 8 July 2013

.20BR is a centerfire wildcat rifle cartridge. It is based on the .22 BR Remington case necked down to accept a .204" diameter bullet and maintaining the same shoulder angle and case length.^[1] The cartridge features a short fat case which is reputed to be both efficient and accurate.^[2]

The large powder capacity of the case allows it to propel a 40 grain bullet at over 4000fps, however the cartridge is considered overbore and can be expected to have a relatively short barrel life.^[1]

The inherent accuracy of the BR case design and the high performance of the .20 BR has led to it being adopted by varmint hunters and target shooters.^{[citation needed]}

Advantages of this cartridge include; its ability to be chambered in any rifle action which has the .308 Winchester sized bolt face; its short length enables action makers to utilise shorter ports to increase rigidity; and cases are easily formed and loaded.^{[citation needed]}

References

^ ^a ^b Hamzeh, Kory. "Twenty Caliber Cartridge Guide". Retrieved 8 July 2013.
^ De Haas, Frank (2003). "Short Stature, Long Range". Bolt Action Rifles - 4th Edition. Krause Publications. pp. 636–643. ISBN 978-0-87349-660-5. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

This ammunition-related article is a stub. You can help Wikipedia by expanding it.

[6mmbr-1] Hamzeh, Kory. "Twenty Caliber Cartridge Guide". Retrieved 8 July 2013.

[short_stature-2] De Haas, Frank (2003). "Short Stature, Long Range". Bolt Action Rifles - 4th Edition. Krause Publications. pp. 636–643. ISBN 978-0-87349-660-5. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

[1]

[2]

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 |en5=
 |test_barrel_length=
-|balsrc= <ref name="6mmbr">{{cite web|last=Hamzeh|first=Kory|title=Twenty Caliber Cartridge Guide|url=http://www.6mmbr.com/20caliber.html|accessdate=8 July 2013}}</ref>
+|balsrc= [http://www.6mmbr.com/20caliber.html 6mmbr.com]
 }}
-'''20BR''' is one of the many 20 caliber rifle cartridges known as wildcats (not commercially available). It is basically a [[.22 BR Remington]] case necked down to accept a .204" diameter bullet maintaining the same shoulder angle and overall length. It was primarily created to combine large powder capacity with a short efficient case design thereby giving superior performance to other 20 caliber wildcat cartridges in common use. Combining the ability to propel a 40 grain bullet above 4000fps and the inherent accuracy of the BR case design, the 20BR quickly became the preferred flavour of many varmint hunters and target shooters alike.
+'''.20BR''' is a [[Centerfire ammunition|centerfire]] [[Wildcat cartridge|wildcat]] [[rifle]] [[Cartridge (firearms)|cartridge]]. It is based on the [[.22 BR Remington]] case necked down to accept a .204" diameter bullet and maintaining the same shoulder angle and case length.<ref name="6mmbr">{{cite web|last=Hamzeh|first=Kory|title=Twenty Caliber Cartridge Guide|url=http://www.6mmbr.com/20caliber.html|accessdate=8 July 2013}}</ref>  The cartridge features a short fat case which is reputed to be both efficient and accurate.<ref name="short_stature">{{cite book|last=De Haas|first=Frank|title=Bolt Action Rifles - 4th Edition|year=2003|publisher=Krause Publications|isbn=978-0-87349-660-5|pages=696|coauthors=Wayne Van Zwoll|pages=636–643|chapter=Short Stature, Long Range}}</ref>
+The large powder capacity of the case allows it to propel a 40 grain bullet at over 4000fps, however the cartridge is considered overbore and can be expected to have a relatively short barrel life.<ref name="6mmbr"/>
-Other advantages of this cartridge include; its ability to suit any rifle action which has the 308 Winchester sized bolt facel; its short length enables action makers to utilise shorter ports to increase rigidity; and cases are easily formed and loaded.
+The inherent accuracy of the BR case design and the high performance of the .20 BR has led to it being adopted by [[Varmint hunting|varmint hunters]] and target shooters.{{Citation needed}}
-Some drawbacks of this cartridge are that it's not commercially available; is considered overbore (a barrel burner) and therefore not economically viable when compared to less aggressive 20 wildcat chamberings.
+Advantages of this cartridge include; its ability to be chambered in any rifle action which has the .308 Winchester sized bolt face; its short length enables action makers to utilise shorter ports to increase rigidity; and cases are easily formed and loaded.{{Citation needed}}
-caliber wildcats based on the 6.8mm SPC and 22 PPC present a middleground between the 20 BR and the more common 20 Tactical and commercially produced 204 Ruger.
 ==See also==
@@ Line 74: / Line 74: @@
 == References ==
-<!--- See [[Wikipedia:Footnotes]] on how to create references using <ref></ref> tags which will then appear here automatically -->
 {{Reflist}}
-== External links ==
-*[http://www.6mmbr.com]
-*[http://www.accurateshooter.com]
-<!--- Categories --->
 {{DEFAULTSORT:20 BR}}
-[[Category:Articles created via the Article Wizard]]
 [[Category:Pistol and rifle cartridges]]