Labradar 5.56 data 1168

[1168]

65*
G19/PMM Barrel/Comp
Blue 125 TC, Ginex primers, HS-6
1.167” COL mixed brass

6.0
Av 1107
Es 133
Sd 39.8

6.1
Av 1125
Es 61
Sd 19.4

6.2
Av 1135
Es 88
Sd 30

6.3
Av 1160
Es 62
Sd 18.9

6.4
Av 1186
Es 54
Sd 21

6.5
Av 1212
Es 66
Sd 22.1

6.6
Av 1219
Es 33
Sd 9.6

6.7
Av 1230
Es 88
Sd 22.2

This shit is loud as ****. All of it cycled, vigorously. I’d say most or all of it had a feel mimicking +p. Mind the COL if you’re thinking about reproducing this. I had a hard time capturing shots reliably because it really made me want to bang away faster than the chrono could keep up.

[opngrnd]

Those loads ended solidly in +P territory, if I'm reading it correctly. I've used plenty of HS-6 for mild to standard velocities in 9mm and mild to full power loads in 38 Super. I always had good luck with it, though I was using it with jacketed bullets.

[1168]

Those loads ended solidly in +P territory, if I'm reading it correctly. I've used plenty of HS-6 for mild to standard velocities in 9mm and mild to full power loads in 38 Super. I always had good luck with it, though I was using it with jacketed bullets.

Thats a really good point. I’m using .355 powdercoated bullets. I got the charge weights from Speer, but my velocities are much higher than they got with plated and jacketed bullets. I seated them long because all of the published data seemed conservative, and I thought I might seek to venture a bit above published charge weights later, to mimic +p loads. But I got what I wanted without doing that.

A friend of mine that was recording normally loads with TG, but occasionally 244 or CFE-P, and he was like “Did you just say 6.0-6.7?…. Are you sure?”

Edit: for anyone wondering, this project is to economically drive the comp while mimicking +p recoil. Shoot me a PM to avoid cluttering the thread if you’d like more discussion on this topic.

[1168]

81*F

12.5” Hodge/Velos
Federal XM855
2819 fps
39 es
13.6 sd

12.5” BCM Kino/Turbo k
XM855
2825 fps
69 es
20.3 sd

12.5” Criterion Core/.264MG7k
XM855
2824 fps
31 es
9.5 sd

69gr Norma .223
2620 fps
38 es
11.1 sd

These barrels are all pretty early in their lives, with the Hodge having the highest round count at like 1k or two.

[vicious_cb]

81*F

12.5” Hodge/Velos
Federal XM855
2819 fps
39 es
13.6 sd

12.5” BCM Kino/Turbo k
XM855
2825 fps
69 es
20.3 sd

12.5” Criterion Core/.264MG7k
XM855
2824 fps
31 es
9.5 sd

69gr Norma .223
2620 fps
38 es
11.1 sd

These barrels are all pretty early in their lives, with the Hodge having the highest round count at like 1k or two.

Thanks for data dump, I hope this debunks a lot of the numbers being thrown around on TOS regarding the velocities of their 12.5 Criterions. Somehow people are getting into 2700's fps with mk262 clones and 3000 fps with XM193 and they are all using the new Garmin chrono. I would be highly suspect of the numbers coming out of their chronos from now on. Not to mention Garand Thumb was just using one to chrono the hybrid .227 fury and the numbers on that seem pretty fantastical.

[Corse]

I just got a Garmin, and so far the numbers are comparable to a traditional chrono and a magnetospeed.