.460 Steyr

.460 Steyr
3D Model of the .460 Steyr cartridge
Type	Rifle
Place of origin	Austria
Production history
Designer	Horst Grillmayer
Designed	2002
Manufacturer	Steyr Mannlicher
Produced	2004–present
Specifications
Parent case	.50 BMG
Case type	Rimless, bottleneck
Bullet diameter	.4579 in (11.63 mm)
Land diameter	.4500 in (11.43 mm)
Neck diameter	0.5008 in (12.72 mm)
Shoulder diameter	0.7205 in (18.30 mm)
Base diameter	0.804 in (20.4 mm)
Rim diameter	0.804 in (20.4 mm)
Rim thickness	0.083 in (2.1 mm)
Case length	3.543 in (90.0 mm)
Overall length	4.918 in (124.9 mm)
Rifling twist	1 in 14
Maximum pressure (C.I.P)	53,664 psi (370.00 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 600 gr (39 g) Monolithic 3,000 ft/s (910 m/s) 11,989 ft⋅lbf (16,255 J)

The .460 Steyr (11.6×90mm Grillmayer) is a center fire cartridge from the weapons manufacturer Steyr Mannlicher, which was developed for sniper rifles. During the development, important features for the military, such as the penetration power of armor or a tracer, were not taken into account. The cartridge was presented for the first time in February 2004 at the ShotShow-2004 in Las Vegas together with the Steyr HS .50.^[1]

The cartridge was designed by Horst Grillmayer in 2002, while the projectile was designed by Guido Wasser. Production started around 2004 together with the Steyr HS .460. The ammunition was developed for precision rifles for sport shooters, with the focus on the long range and bypassing the 12.7 × 99 mm NATO (.50 BMG) caliber, the use of which is prohibited in many European countries for non-official purposes.^[2] The ammunition can also be of interest to armies deployed abroad, which have been banned from using 12.7 mm ammunition in peacekeeping operations.^[3]