Labradar 5.56 data 1168

[1168]

Shot a little more. 11.3” and 12.3” BA Hanson barrels, with M4SD-k. 80*F

*Aguila .223 55gr

11.3” suppressed
2577 av
84 es
26.3 sd

*Hornady Frontier 68gr 5.56

11.3” suppressed
2632 av
63 es
20.5 sd

12.3” suppressed
2722 av
209 es
57.6 sd
I noticed that there was a single round outlier that blew the ES. I’m gonna shoot this string again another day. This barrel has a very low round count, not sure if that matters.


We’ve noticed that the 16” barrel in the OP is “slow” in back-to-back comparisons with an 11.5” and 14.5” guns, with the 11.5” losing very little velocity, and the 14.5 getting more velocity than the 16”. You can see above that the 12.3” barrel had essentially the same velocity as the 16” with 68gr Frontier, but that was on different days with different temps.

*M&P 9
147gr Blue Bullets
Titegroup

3.3gr
Av 952
Es 30
Sd 9.8

3.4gr
Av 966
Es 36
Sd 11.2

3.5gr
Av 972
Es 38
Sd 10.1

3.6gr
Av 991
Es 27
Sd 9.6

3.7gr
Av 999
Es 21
Sd 7.7

*MPX (8”)
147gr Blue Bullets
Titegroup

3.5gr
Av 1039
Es 26
Sd 7.8

3.6gr
Av 1055
Es 23
Sd 8.2

3.7gr
Av 1079
Es 15
Sd 6.6