Last edited by _Stormin_; 04-03-17 at 20:23.
"SEND IT" happens to be my trigger words...
Here's some of the chrono data for those interested:
16" barrel:
77 gr 2713 fps, SD 13 -------> with no suppressor 2703, sd 15
69 gr 2833 fps, SD 10
14.5" barrel:
77 gr 2648 fps, sd 21
69 gr 2776 fps, sd 31
11.5" barrel:
77 gr 2520 fps, sd 12 -----> with no suppressor 2498 fps, sd 20
69 gr 2520 fps, sd 20
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
We seemed to see a little free bore boost above.
10.5 and 10.3 Colt were a little interesting:
10.5"
77 gr 2436, sd 8
69 gr 2540, sd 19
10.3"
77 gr 2406 fps, sd 13 (30 fps slower than the 10.5)
69 gr 2499 fps, sd 14 (41 fps slower than the 10.5)
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
We had one bad mag that "bolt overed" in a few of our guns, ruining 3 live rounds. So we threw the mag down range and shot it. The TMKs in this load have a cannalure. You can't see it peeking out of the neck, but it's there. I found the cannalure when I pulled apart a few of the 77gr rounds that the bad mag destroyed.
The SDs are all really good for our 5 round strings. The ammo is hot, for sure. I can feel it on my 14.5 bcm middy, and most of the shorties. But there aren't any pressure signs on the brass at all. No case head swipes or anything.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
This one surprised me the most. Lost that much speed going from 10.5 to 10.3, wow. Im sure other factors are at play. Any of the great minds know if the shorter the barrel, the more speed you lose per inch of barrel. And would you have expected that drop?
FYI, the 10.3 was a Colt 6945 monolithic upper with a Sig can on it.
The 10.5 was a CL Noveske with AAC can on it.
Mark has some can , no can data as well. But everything pretty much played out like it should with the test as a whole which proves out once again the ammo is very consistent and reliable.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
My guess would be the slower Colt barrel being the culprit- or the Noveske is "fast".
.2" shouldn't account for the velocity loss you experienced.
Tighter/looser chambers would be where I'd start looking.
Of course you could cut .2" off the Noveske and see what velocity you lose.
I'm really enjoying your experiences here, so much so that I've ordered some 69 gr. TMK to try myself.
Last edited by gaijin; 04-04-17 at 11:58.
I have a DD 10.3 that Im going to have to chrono just for shits and giggles. I didn't want to take 9 million guns out, but It would have been more data. We'll find out who was fast or slow and post.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
Good plan.
Let us know the score.
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