SLW Barrel Shootout – CBC 77gr Ammo Performance

The second ammo we are posting the data for is one of my favorite ‘go-to’ 5.56 rounds, the CBC 77gr OTM (also sold as Magtech First Defense Sniper). It has always been a good shooting round for me and I have shot it (successfully!) out to 1000 yards. It is also one of the most affordable rounds we shot (if you can find it in stock) at $0.59 – $0.69 a round.

All Chrono data was measured by a LabRadar Doppler Chronograph and the data was pulled from the strings saved to its SD card

All target measurements were done with OnTarget Precision Calculator software.


The CBC 77gr shot an average of 2637.317 fps between the 60 shots fired out of the 3 different 16″ barrels we tested. The CBC 77gr load had one of the highest velocities, second only to IMI 77gr however it also had one of the higher Standard Deviations of all the ammo tested. The graph below shows the shot to shot velocity of each string and also the average of each string at the end (data point 11). Further down is the raw data that this graph was generated from.

cbc-77gr-velocity-fps-16-barrel

 

Ballistic Advantage (Series 1) Ballistic Advantage (Series 2)
Stats – Average 2634.06 fps Stats – Average 2632.84 fps
Stats – Highest 2659.5 fps Stats – Highest 2661.37 fps
Stats – Lowest 2596 fps Stats – Lowest 2600.42 fps
Stats – Ext. Spread 63.5 fps Stats – Ext. Spread 60.95 fps
Stats – Std. Dev 24.18 fps Stats – Std. Dev 19.76 fps
Shot ID V0 11/12/2016 Shot ID V0 11/13/2016
1 2655 15:21:32 1 2634 11:51:36
2 2596 15:21:55 2 2654 11:52:03
3 2659 15:22:06 3 2615 11:52:25
4 2608 15:22:22 4 2661 11:52:47
5 2624 15:22:39 5 2651 11:53:10
6 2655 15:22:56 6 2624 11:53:49
7 2621 15:23:09 7 2620 11:54:15
8 2659 15:23:23 8 2600 11:54:36
9 2650 15:23:37 9 2622 11:54:58
10 2613 15:23:50 10 2646 11:55:16
Criterion (Series 1) Criterion (Series 2)
Stats – Average 2635.45 fps Stats – Average 2634.95 fps
Stats – Highest 2703.38 fps Stats – Highest 2666.39 fps
Stats – Lowest 2582.85 fps Stats – Lowest 2565.28 fps
Stats – Ext. Spread 120.53 fps Stats – Ext. Spread 101.11 fps
Stats – Std. Dev 36.73 fps Stats – Std. Dev 31.54 fps
Shot ID V0 11/12/2016 Shot ID V0 11/13/2016
1 2634 15:50:25 1 2662 13:30:48
2 2595 15:50:41 2 2665 13:31:15
3 2642 15:50:53 3 2649 13:31:49
4 2583 15:51:10 4 2606 13:32:16
5 2610 15:51:21 5 2646 13:32:36
6 2622 15:51:33 6 2565 13:33:33
7 2703 15:51:50 7 2620 13:33:56
8 2682 15:52:03 8 2627 13:34:20
9 2643 15:52:15 9 2642 13:34:49
10 2641 15:52:29 10 2666 13:35:14
LaRue (Series 1) LaRue (Series 2)
Stats – Average 2663.81 fps Stats – Average 2623.03 fps
Stats – Highest 2700.98 fps Stats – Highest 2670.25 fps
Stats – Lowest 2621.23 fps Stats – Lowest 2573.44 fps
Stats – Ext. Spread 79.74 fps Stats – Ext. Spread 96.81 fps
Stats – Std. Dev 25.82 fps Stats – Std. Dev 24.77 fps
Shot ID V0 11/12/2016 Shot ID V0 11/13/2016
1 2631 16:55:03 1 2637 11:34:52
2 2664 16:55:17 2 2614 11:35:14
3 2661 16:55:31 3 2670 11:35:43
4 2621 16:55:44 4 2614 11:36:06
5 2656 16:55:57 5 2619 11:36:24
6 2655 16:56:12 6 2573 11:37:06
7 2701 16:56:26 7 2625 11:37:26
8 2676 16:56:42 8 2610 11:37:51
9 2700 16:56:54 9 2629 11:38:13
10 2674 16:57:10 10 2639 11:38:39

Next are the targets, each barrel shot one 10 round and 2 5 round groups for a total of 60 rounds fired. Barrel 2 turned in the smallest group with a .784 MOA group and a 5 shot group average of 1.2285 MOA averaged between all 6 groups. As you can see there were numerous Sub-MOA groups between all 3 barrels with this ammo.

cbc-10-and-5-shot-watermark

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