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+--- Thread: Loads starting to come together (/showthread.php?tid=1485)
Loads starting to come together - Diesel Pro - 01-02-2025
Finally got some time to run the 6ARC using 103 ELDX and 90 ELDX. Top 8 are 103 and bottom 4 are 90. All 5 shot groups at 100 yds portable bench at my in wood range protected from most wind. Temps around 32f. I had a little mirage and eye watering to deal with, but seems when I was patient enough to wait a bit things cleared. Using my Leupold VXIII 4.5-14. I prefer a little better glass for my load development, but this one was handy. I also prefer a distinct + to help align the crosshairs so I altered my targets for next session.
First group looks decent unfortunately not zero'd quite right. I plan to explore the next steps higher on the 103 to see if the SD comes down. My 90 gr go-to loads are not shown here. I went where QL told me to go and put the other loads on a different target. They picked up speed and higher SD with the suppressor so I am slowing them down a bit.
Gun is Cobalt Kinetics AR 15 SPR Elite with 22" Proof carbon barrel. I'm impressed, especially for a semi auto.
Powder used is LVR. Charge weights approaching or exceeding max on the 103.
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RE: Loads starting to come together - SpeyRod - 01-04-2025
What was the 3rd 90 gr load and its speed? A friends Proof barreled are shoots the 103 factory loads extremely well.
RE: Loads starting to come together - Rickhem - 01-07-2025
There are some really nice groups in there, and thanks for shooting 5 shot groups.
That 28.4 load looks really nice!
RE: Loads starting to come together - Diesel Pro - 01-14-2025
(01-07-2025, 02:01 PM)Rickhem Wrote: There are some really nice groups in there, and thanks for shooting 5 shot groups.
That 28.4 load looks really nice!
28.9 I don't always do a good job of closing the top of my 9's especially with a sharpie and light contact.
After the session that I posted, my suppressor was tight coming off and spun off the CK muzzle device so I had to reset it and added a bit of blue loctite. I also changed gas blocks to a Superlative and run it in the bleed off setting about 48 clicks out.
SD at 28.9 is a bit high for my liking. I was out again with 29, 29.1, 29.2, and 29.3 pushing up past max. It was uncomfortably cold out so my groups were so-so. The 29 gr charge had a much better SD and a decent group so that is what I am focusing on right now. I'm kind of torn between the 90 and 103, but leaning more towards the 90. I'll comment more in another post.
At recent session I found a pretty substantial POI shift (approx 4" down and right) that left me scratching my head. I think it mostly came from the muzzle device remount near as I can figure. It's indexed same/properly so not sure yet Velocities remained same/similar. I use a Bobro QD mount and at first I questioned it, but I followed up the session with a quick zero check of a thermal and found similar shift.
RE: Loads starting to come together - Diesel Pro - 01-14-2025
(01-04-2025, 07:39 PM)SpeyRod Wrote: What was the 3rd 90 gr load and its speed? A friends Proof barreled are shoots the 103 factory loads extremely well.
The 3rd group 90 ELDX is 29gr charge
Next session I found that the 103 likes that same charge.
For the 90 I'm torn between 30gr charge and 29gr, but the 30gr charge is 100fps faster. The 103 I had to change my zero. The 30gr charge target is 10 rds and for whatever reason seems to show 2 different groups. Could be a cheek weld issue would be my guess.
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RE: Loads starting to come together - Rickhem - 01-15-2025
(01-14-2025, 04:06 PM)Diesel Pro Wrote: 28.9 I don't always do a good job of closing the top of my 9's especially with a sharpieI actually have that same issue. The QA people took a while to get used to reading my lab notebooks.
Groups look really good though, and you can see the progress. Looks like the 28.8 to 28.9 charge is a good node for you.
RE: Loads starting to come together - Diesel Pro - 01-15-2025
(01-15-2025, 02:48 PM)Rickhem Wrote:(01-14-2025, 04:06 PM)Diesel Pro Wrote: 28.9 I don't always do a good job of closing the top of my 9's especially with a sharpieI actually have that same issue. The QA people took a while to get used to reading my lab notebooks.
Groups look really good though, and you can see the progress. Looks like the 28.8 to 28.9 charge is a good node for you.
29.0 the SD dropped to single digits and IIRC 29.1 the velocity dropped a touch.
I've been a bit down on the semi auto for accuracy, but once I changed my bench technique/setup it got much better. Between this one and my BCM .223 i do have a pair of nice tack drivers.
The Cobalt has a Geiselle SSA 2 stage trigger and I hate it. Probably not a bad trigger, but I'm not a 2 stage trigger guy.