5.6×52mmR

5.6x52mmR
Type	Rifle
Place of origin	United States
Production history
Designer	Charles Newton
Manufacturer	Savage Arms Norma (company) Sellier & Bellot Wolf Ammunition
Produced	1912
Variants	.22 Marciante Blue Streak
Specifications
Parent cartridge	.25-35 Winchester
Case type	Bottleneck, Rimmed
Bullet diameter	.227 in (5.8 mm)
Neck diameter	.252 in (6.4 mm)
Shoulder diameter	.360 Hornaday now makes a .227" bullet for this cartridge in the US, Graf's has loaded ammo and brass, and Buffalo Arms and Huntington's Custom Die sells .228" bullets.
Base diameter	.416 in (10.6 mm)
Rim diameter	.500 in (12.7 mm)
Case length	2.05 in (52 mm)
Overall length	2.51 in (64 mm)
Rifling twist	12
Primer type	large rifle
Ballistic performance Bullet weight/type Velocity Energy 70 gr (5 g) 3,100 ft/s (940 m/s) 1,493 ft·lbf (2,024 J)
Source(s): Barnes, Frank C. "Cartridges of the World." Digest Books, Inc. 3rd Edition: 1972

The 5.6x52mmR cartridge was created by Charles Newton and produced by Savage Arms in 1912. It is also known as the .22 Savage High-Power and .22 "Imp", and is based upon the .25-35 Winchester cartridge necked down to accept a .227in/.228in diameter bullet.

Its inherent accuracy, relatively high velocity and "shocking" power led to an initial surge of popularity, and the "Imp" was attributed with almost magical killing powers even on large and dangerous soft-skinned game such as tigers. However, following a well-publicized spate of fatalities and severe injuries among big game hunters who had merely wounded their quarry with the "Imp's" small, speedy bullets, the cartridge rapidly fell out of favor with safari and deer hunters. Some small-pest shooters in the USA have continued to use it into the 21st century, although the caliber fell into gradual disfavor in the United States shortly after World War I.

No ammunition or mass-market rifle-making company in the U.S. produces the .22SHP as of 2007, either as a cartridge or a factory chambering. Norma, Sellier & Bellot, and Wolf Ammunition (through their "gold" line) still manufacture ammunition for the European market, and export it to the U.S. In the 5.6x52mmR designation this cartridge remains significant among hunters in Europe, where it is often a chambering in drillings and similar combination guns.

Specifications

Bullet diameter: .227"

Case length: 52 mm

Loads: 70 gr @ 3100 ft/s

References

http://www.chuckhawks.com/5-6x52r.htm