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I refuse to say that a fuel pump has a cam..so I will keep them gears lolNo gears in the cp4.
Additive doesn’t seem to make a difference. Some run it religiously and they fail early and some never run it and have no problems for 100s of 1000s of miles. They’re simply a gamble. I saw one the other day that failed with less than 300 miles on it. My dcr has been good so far. But my cp4 had 218k on it. One little wear line on one of the lifter rollers was all you could see. Rest looked great.
That's disappointing for sure. I have a Criterion 16" Hybrid that is factory nitrided 416R stainless and it does really well with 23.3 - 23.5 grains of 8208 XBR and 77 SMK's. My COL is around or just under 2.250", this load shoots very consistently well 10 round groups for me in both the Criterion and a 16" Bartlein/LMT, my URGI is a little larger, but still good 1.1 - 1.4 MOA for 10 rounds.Im curious if the OP sent the barrel in and what Criterion said. I just installed a 16” mid gas criterion core 223 wylde barrel (with a headspaced bcm bolt) on a bcm blem upper and KAK handguard (with a non adjustable badger ordinance gas block). When I checked headspace with the stripped bolt it was really tight (didn’t close on 1.4646 and barely closed on 1.4636).
I only have about 140 rounds through it (mainly BH 77 OTM factory ammo and various handloads with 77smk’s) and the accuracy at 100 yds has been disappointing. Getting 2-3” 10 round groups while my 5.56 nato 14.5” super duty will easily get me sub moa 10 shot groups. Not sure what is causing the issues but I removed and reinstalled the barrel nut to make sure it has clearance for the gas tube, the way it was timed in my initial install the nut had some contact with the tube. I will try different COAL on my handloads due to the slightly different freebore length in 223 wylde vs 556 chambers to see if that helps. I also removed the yhm phantom flash hider to get rid of as many variables on the barrel as possible. Working on another batch of 50 rds of handloads to see if these changes helped.
Im open to any other suggestions and ideas to troubleshoot accuracy issues. Could be that the barrel doesn’t like this combo of powder and bullet so im not ready to pull the barrel until I get more data with other powders and COAL.
Below is my target from my last range trip to test loads with 8208 xbr.
View attachment 8670915
What's your barrel length? With 110s you should be getting much higher velocity.Unfortunately I’m realizing I haven’t even fired 100 rounds through this rifle so it was probably too early to do load development… but here’s what I got
1x fired Starline 6.5 Grendel brass
Shoulder bumped 0.004”
0.285 bushing for 0.004 neck tension
COAL 2.25”
Lehigh 110 grain match solids
H335 at 28, 28.3, and 28.6 all produced terrible groups.
Each would produce 3 rounds touching and then 2 flyers
TAC at 28, 28.3, and 28.6 grains
Only 28 grains produced acceptable 5 round group size of approximately 0.8 MOA.
Min 2398
Max 2437
Is that reasonable or should I try some other combinations to get higher velocity?
They don’t make chucks in men’s sizes unfortunately
Wetting your pants laughing from watching the smoke bum taking a big drag of hair smoke and then gagging or puking!
Burning horse hair is NASTY smelling!
seems about as sharp as he was 2 years or so ago