There are many options on the market today for match shooters using the AR15 platform. They are all compromises driven by the limitations of the AR-15 magazine length and the size of the bolt.
This new system directly addresses the size of the bolt while retaining the standard AR-15 lower receiver allowing a move to the larger BR family of cartridges.
The current crop of AR-15 match calibers offer impressive improvements in capability over .223 Rem. The 6mm AR is a fine adaptation of the 6.5 Grendel(R) cartridge, itself derived from the PPC family and originally 7.62x39. It's performance is about 2700fps with a 107 gr Sierra. Another new and capable choice is the 6mm HAGAR(R). This offers very similar performance to the 6AR. It's major drawback is the inability to shoot the heavier 105-107gr bullets at magazine length on the 300 yard line. The 6BR and 6BRX can easily accommodate the 105-108gr 6mm bullets for 300 yards.
In addition none of these calibers have the proven accuracy history or large number national championships and records for accuracy in F Class and Bench Rest competition as does the 6BR.
.223 6.5 Grendel 6 AR 6 WOA 6 BR 6BRX 6.5x47 .260 Rem
The 6BRX available in our uppers brings even more performance to the AR15 platform. With a 105gr Berger VLD, velocities of 2950fps or better are readily available. This is significantly higher than can be readily and safely achieved with any of the other options for the AR15 on the market today.
Below are some velocity and wind drift comparisons for different bullet types:
Below numbers are from Quickload(R) using a 28" barrel and 52,000 max pressure.
VV N550, 105gr Berger VLD, 2.40" VV N540, 107gr Sierra, 2.40" VV N540, 90gr Lapua, 2.26"
Cartridge H2O Cap. Velocity Velocity Velocity
6 H 37.5grs 2816 2664 2881
6AR 36.0grs 2846 2664 2915
6BR 37.8grs 2875 2725 2947
6BRX 43.0grs 3000 2847 3087
6XC* 49.7grs 3054 2910 3167
* Seated to 2.80"
Wind drift in a 10mph cross wind calculated using the Sierra Infinity(R) program and the above velocities.
Cartridge Bullet 300yds 600yds 1000yds
6 H 105gr Berger VLD 5.38* 23.67 75.47
6AR 105gr Berger VLD 5.30 23.30 74.26
6BR 105gr Berger VLD 5.22 22.95 73.12
6BRX 105gr Berger VLD 4.92 21.55 68.52
6XC 105gr Berger VLD 4.80 21.0 66.69
* Can't be used in a magazine w/6 H
Cartridge Bullet 300yds 600yds 1000yds
6 H 107gr Sierra 6.33* 28.26 92.09
6AR 107gr Sierra 6.33 28.26 92.09
6BR 107gr Sierra 6.11 27.26 88.86
6BRX 107gr Sierra 5.73 25.47 82.84
6XC 107gr Sierra 5.54 24.62 79.97
.223 Rem 80gr Sierra @2850 7.80 36.21 121.69
* Can't be used in a magazine w/6 H
Cartridge Bullet 300yds 600yds 1000yds
6 H 90gr Lapua 7.23 33.0 109.99
6AR 90gr Lapua 7.11 32.42 108.18
6BR 90gr Lapua 7.0 31.89 106.5
6BRX 90gr Lapua 6.56 29.74 99.51
6XC 90gr Lapua 6.33 28.64 95.79
.223 Rem 77gr Sierra @2800 8.92 41.96 142.49