Loading AI tools
Rifle cartridge From Wikipedia, the free encyclopedia
The .20 BR is a centerfire wildcat rifle cartridge. It is based on the .22 BR Remington case necked down to accept a 5.2 millimetres (0.204 in) diameter bullet and maintaining the shoulder angle of 30° and case length of 39 millimetres (1.535 in). The cartridge features a short fat case which is reputed to be both efficient and accurate.[1]
![]() | This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)
|
.20 BR | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Type | Rifle | |||||||||||
Place of origin | US | |||||||||||
Specifications | ||||||||||||
Parent case | .22 BR Remington | |||||||||||
Case type | Rimless, bottleneck | |||||||||||
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 | 1.535 in (39.0 mm) | |||||||||||
Primer type | small rifle | |||||||||||
Ballistic performance | ||||||||||||
| ||||||||||||
Source(s): 6mmbr.com |
The large powder capacity of the case allows it to propel a 2.6 grams (40 gr) bullet at over 1,200 metres per second (4,000 ft/s), however the cartridge is considered overbore and can be expected to have a relatively short barrel life.
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]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.