US centerfire rifle cartridge
6.5-06 A-Square |
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Type | Centerfire rifle |
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Place of origin | United States |
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Production history |
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Designer | A-Square |
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Designed | 1997 |
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Specifications |
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Parent case | .30-06 Springfield |
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Case type | Rimless, bottleneck |
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Bullet diameter | .264 in (6.7 mm) |
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Neck diameter | .296 in (7.5 mm) |
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Shoulder diameter | .4425 in (11.24 mm) |
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Base diameter | .4698 in (11.93 mm) |
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Rim diameter | .473 in (12.0 mm) |
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Rim thickness | .034 in (0.86 mm) |
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Case length | 2.494 in (63.3 mm) |
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Overall length | 3.44 in (87 mm) |
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Case capacity | 65.7 gr H2O |
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Rifling twist | 1-9"[1] |
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Primer type | Large rifle |
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Maximum pressure | 60,200 psi (415 MPa) |
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Ballistic performance |
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Bullet mass/type | Velocity | Energy | 100 gr (6 g) Nosler Ballistic Tip | 3,400 ft/s (1,000 m/s) | 2,566 ft⋅lbf (3,479 J) | 140 gr (9 g) Nosler Partition | 3,000 ft/s (910 m/s) | 2,797 ft⋅lbf (3,792 J) | |
Source(s): A-Square Co. |
The 6.5-06 A-Square is a centerfire rifle cartridge that originated as a wildcat, based on the popular .30-06 Springfield. A-Square standardized the dimensions of the cartridge and submitted them to SAAMI in 1997.
Design
The 6.5-06 A-Square uses a .264" diameter bullet loaded into a modified .30-06 Springfield cartridge. The neck is reduced to accept the smaller bullet, the shoulder is longer than that of the parent cartridge, and it has a 17.5 degree shoulder angle leading to the neck of the case, where the bullet is seated.[1] The Ackley Improved version of the cartridge uses a sharper shoulder angle and has a case capacity of 72 gr of water.
Uses
The 6.5-06 A-Square has power similar to that of the .270 Winchester and .308 Winchester, making it suitable for hunting medium-sized game such as deer and black bear. It is also used in competitions such as F-Class and Benchrest formats.
Availability of ammunition
Currently (2011) none of the major commercial ammunition manufacturers offer factory loaded 6.5-06 A-Square ammunition. There are smaller companies that custom load the cartridge[2] however, and hand-loading can be accomplished using the proper set of dies and using .25-06 Remington, .270 Winchester, or .30-06 Springfield brass and making the proper modifications to fit the 6.5-06 A-Square chamber. After firing, the brass from the original cartridge (.25-06 Remington, .270 Winchester, or .30-06 Springfield) will be fire-formed to the exact dimensions of the 6.5-06 A-Square chamber.
Firearms chambered for 6.5-06 A-Square
As of 2011, A-Square listed two different rifles factory chambered in 6.5-06 A-Square; the Hamilcar and the Genghis Khan.[3] Several of the major custom barrel manufacturers offer the 6.5-06 A-Square (sometimes listed simply as 6.5-06) chamber as an option for builders of custom rifles. However, On 15 February 2012, the A-Square Company ceased to exist.[citation needed]
See also
References
- ^ a b "MAXIMUM CARTRIDGE / MINIMUM CHAMBER" (PDF). Archived from the original (PDF) on 2011-07-26. Retrieved 2011-04-19.
- ^ "cpcartridge index". Archived from the original on 2011-05-25. Retrieved 2011-04-28.
- ^ "Rifles". Archived from the original on 2010-08-21. Retrieved 2011-04-19.
Cartridges derived from the .30-03 Springfield
Prototype | |
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First generation | Based on .30-03 Springfield | |
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Second generation | Based on .30-06 Springfield | |
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Third generation | |
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Fourth generation | |
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Fifth generation | |
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Sixth generation | Based on .243 Winchester | |
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Based on .307 Winchester | |
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Based on .308×1.5-inch Barnes | |
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Seventh generation | Based on 6mm BR | |
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Based on .22 BR | |
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Eighth generation | |
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Related | |
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