Labradar 5.56 data 1168

[markm]

Ok. With summer heat coming on, I should be hiding indoors and loading more.

[1168]

60*F
M855

*Noveske 14.5”/MG7k .264
Av 2884
Es 114
Sd 37.2

*PWS 14.5”/Chimera
Av 2885
Es 96
Sd 28.7
Disappointed with both of these results. These barrel used to be fast, but they got Jenna Jamoed and Heathered, and they’ve lost a hundo. We were trying to find a gun with a tight chamber to work up loads in, and these aren’t them, anymore.

*PSA 16” middy/mock dissy/ 30SDk
CCI 450/Tac, Hornady 55gr FMJ

24.4gr
Av 2699
Es 243
Sd 71.7
Cycled with no can.

24.7gr
Av 2723
Es 180
Sd 54.8

25.0gr
Av 2807
Es 159
Sd 56.5
A popular load.

25.3gr
Av 2834
Es 163
Sd 53.5

25.6gr
Av 2933
Es 167
Sd 49

25.9gr
Av 2942
Es 102
Sd 35.4
I’m going to explore this more later.

26.2gr
Av 3062
Es 95
Sd 26.8

26.5gr
Av 3049
Es 76
Sd 20.2
193 clone, maybe.

26.8gr
Av 3077
Es 85
Sd 20.3
Recoil increased.

27.0gr ***dangerous***
Av 3101
Es 88
Sd 29.2
Primers were flat like a dude’s tits.

Crimps with LFCD were on the light side. Could only see evidence of crimp on 1/10.

[1168]

*PSA 16” Middy/Dissy 60*F, 30SDk
CCI450, Mixed brass, BLC-2, Hornady 62 FMJ

25.0gr
Av 2537
Es 64
Sd 20.3
Cycles with no can.


25.3gr
Av 2586
Es 112
Sd 30

25.6gr
Av 2648
Es 183
Sd 54.4

25.9gr
Av 2705
Es 174
Sd 53.9

26.2gr
Av 2718
Es 155
Sd 42.9

26.5gr
Av 2767
Es 115
Sd 35.6
I’d like to explore this more.

26.8gr
Av 2827
Es 147
Sd 47.

27.1gr
Av 2871
Es 123
Sd 38.6

I’ll try a little more near max, but this powder lot is disappointing. I’m used to this powder providing good velocities with minimal pressure, at moderate charges. Crimps were as noted above with LFCD.

[markm]

Are your CCI450s new production? I'm giving the #41s another go with TAC and 69gr RMR bullets for a chrome lined bulk blaster load if I can tame the primers.

[1168]

Are your CCI450s new production? I'm giving the #41s another go with TAC and 69gr RMR bullets for a chrome lined bulk blaster load if I can tame the primers.

They are. I’ve become very distrustful of the new 41s, though.

[opngrnd]

They are. I’ve become very distrustful of the new 41s, though.

Have you been having issues with the #41s?

[1168]

Have you been having issues with the #41s?

A friend and I bought a pile of bulk powder in 2019 and worked up a medium load that made us happy. But over the intervening years we started having increasing velocities and pressures. I don’t really know if its the shitty powder or the primers, but we got stuck buying 41s by the hundo during that period, so lot-to-lot variations might have been the problem. At the same time, MarkM was posting about large velocity increases in his familiar loads with 41s, so I got paranoid. Previously, I was using them with the goal of consistency.

[1168]

62*F
12” 9mm XCaliber Blowback AR
1.1” COL
Winclean 244
Mixed brass
Ginex primers
147gr Blue FP
No silencer (chrono wouldn’t register)

3.0gr
Av 1010 (991-1023)
Es 32
Sd 10.1

3.1gr
Av 1009 (971-1032)
Es 61
Sd 15.6

3.2
Av 1052
Es 71
Sd 19.6

3.3
Av 1075
Es 2.6
Sd 8.8

[vicious_cb]

62*F
12” XCaliber Blowback AR
1.1” COL
Winclean 244

3.0gr
Av 1010 (991-1023)
Es 32
Sd 10.1

3.1gr
Av 1009 (971-1032)
Es 61
Sd 15.6

3.2
Av 1052
Es 71
Sd 19.6

3.3
Av 1075
Es 2.6
Sd 8.8

Is 244 the stuff they're trying to replace 241 with? ~3gr is pretty light for a powder with supposedly similar burn rate to 241.

[1168]

Is 244 the stuff they're trying to replace 241 with? ~3gr is pretty light for a powder with supposedly similar burn rate to 241.

Not sure. I’m using it in subsonic carbine loads, and its been quite good in that capacity. Its got good SDs at a low charge weight, and a relatively small velocity delta from a Glock to a carbine training analogue. Seems pretty happy at low weights.