6mm ARC
Overview
The 6mm Advanced Rifle
Cartridge (6×38mm), or 6mm ARC for short, is a 6 mm (.243) caliber intermediate rifle cartridge designed as a low-recoil, high-accuracy long-range cartridge, designed for use in the AR-15 platform at request of a special forces unit for its multipurpose combat rifle program.
The 6mm ARC is a great all round cartridge, offering great ballistics and similar (25rnd) magazine capacity to 5.56 but at a slightly increased weight. Due to its military usage it also has tracer and armor piercing offerings.
Stats
| Ammunition Type | Damage | Bullet Velocity (m/s) | Barrier Penetration (AP) |
| 108gr Match | 11.5 | 853.44 | 1.66 |
| 115gr Hunter | 13.6 | 803.99 | 1.19 |
| 85gr Velocitor | 8.2 | 1023.1 | 2.85 |
| AP | 9.7 | 840.1 | 9 |
Range Cards
| 108gr Match |
115gr Hunter | 85gr Velocitor | Tungsten Core Armor Piercing |
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Penetration Testing
Standardised penetration test at 100m against three materials: Timber, Steel and Concrete.
Timber is spaced at 1m Intervals, with 7 walls.
Steel is spaced at 1m Intervals with 4 plates.
Concrete is spaced at 2m Intervals with 4 walls.
This testing is relatively limited in what data it can provide and how it can be interpreted.
Here is how I will score it:
Penetration - x/7 (How much of said material it penetrated)
Deviation - Severe/Acceptable/None (How much it deviated during/after penetration)
Slowdown - Stopped/Severe/Minor/None (Change in velocity as a result of successful penetration)
| Load |
(Timber) Penetration Deviation Slowdown |
(Steel) Penetration Deviation Slowdown |
(Concrete) Penetration Deviation Slowdown |
| 108gr Match | 7/7 None None |
0/4 N/A Stopped |
0/4 N/A Stopped |
| 115gr Hunter | 1/7 Severe Severe |
0/4 N/A Stopped |
0/4 N/A Stopped |
| 85gr Velocitor | 7/7 Acceptable Minor |
0/4 N/A Stopped |
0/4 N/A Stopped |
| Armor Piercing | 7/7 None None |
4/4 Acceptable Minor |
2/4 None Stopped |