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Not the op but most likely differences in chambers. I have the same issue with my 77gr tac load. My arp barrel barrel blew out primers before I hit published 556 load data, but my fn barrel has no issue.Quote:
Originally Posted by AndyLate
Sent from my SM-G973U using Tapatalk
@1168:
I have a BRT 16" MPR and it did the following:
"63*F 49% humidity
Wolf 55gr avg 2918 sd 21 Es 51
M855 62gr avg 2971 sd 15.5 Es 37"
Mine seems to be just a little bit faster than your 16" LPR, but they should be comparable in everything except the profile.
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65*F
*12” stainless PCC / 147gr Blue bullets
3.8gr CFE Pistol
1069 av
24 es
8.8 sd
4.2gr CFE Pistol
1139 av
28 es
10.1 sd
This may not be the best powder for subs.
*G19/Odessa 2 baffles/Griffin threaded barrel/ 147gr Blue bullets
3.9 CFE Pistol
938 av
53 es
15.3 sd
4.0 CFE Pistol
970 av
18 es
6 sd
4.1 CFE Pistol
987 av
38 es
13 sd
4.2 CFE Pistol
995 av
29 es
9.2 sd
4.3 CFE Pistol (book max)
1009 av
32 es
9.6 sd
* PSA 14.5” chrome lined, Chimera
M855
2992 av
51 es
16.2 sd
I got this same average previously in a Noveske stainless 14.5”, which was a pretty fast barrel. This barrel concerns us a bit, since my own PSA 16” barrel did not pass the 5.56? gauge test, so this one also may be “tight”. We also had to mortar it a few times later in the day.
25.6 WC846/62gr Hornady FMJ ***dangerous***
3009 av
47 es
14.9 sd
As you can see, even in cooler weather, its hotter than M855. We’ll have to wait for it to get cold to shoot it up. (Don’t take that as advice)
*12.3” Hanson / Turbo K
M855
2752 av
69 es
18.9 sd
Tula 55gr fmj
2750 av
55 es
20 sd
Most consistent of the 3 55gr loads chronoed today…
Winchester “m193” (store bought)
2828 av
176 es
58.7 sd
Aguila 55gr .223
2758 av
78 es
30.5 sd
Hornady Frontier 68 gr 5.56
2652 av
47 es
15.3 sd
Took the words right out of my mind as I was reading through that data.Quote:
Originally Posted by Bimmer
Those are ridiculously high ES numbers.
You’re not wrongQuote:
Originally Posted by HKGuns
1168 or anyone else with a Labradar...could yall run these side by side with a regular chrono..something like a ProChrono just to see how accurate the less costly chronos are?
I had up some good chrono info myself, was up for six/seven months then some dipshit said if I took those wth an optical chrono.."I can throw those results in the garbage".
So I went back, deleted errthang and did just that.
Would be cool to see how close they would be tho.
Not quite what you asked, but here's a comparison of various chronos:Quote:
Originally Posted by Straight Shooter
https://www.longrangeonly.com/forum/...er-chrono.144/
http://bulletin.accurateshooter.com/...vs-oehler-35p/
My 2¢: An optical chrono is precise enough. I have a ProChrono, and it meets my needs.
Mostly I'm clocking pistol rounds, and minor variations (<3%) because I don't have it set up perfectly straight or whatever don't really matter. (I'm not worried about testing for power factor, just clocking my reloads because I'm a geek.)
For rifle rounds, again, I don't think a couple percentage points really matters in terms of load development and/or calculating trajectories.
Or rather, if I was going to spend $500 on a new toy, it wouldn't be a fancy chrono...
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Any black Friday deal on a lab radar?