Rapidly lost room in my pants! Fuckin report that 400yd testing ASAP!
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ARC Coup de Grace Builds
- Thread starter Awag1000
- Start date
Cerakote is just a very expensive paint. That shit is a fucking hoodwink!
So 400y range was closed. So went to 300y range. The 153.5 s won out over the 156s(they may need a lil more tuning) the low node with 153s sped up from 2610 to 2630, barrels just crossed 200rd mark. High node also moved to just over 2700 and that's a lil warm with H4350. So loaded 38.8gr 4350 with 153.5s jumping 30k.Rapidly lost room in my pants! Fuckin report that 400yd testing ASAP!
Took to my buddies this am, he has steel at 660 and 850. Rifle shot very well. Put 5 rounds on the 850y ipsc that were less than 0.15 mil group, so half moa or better. Es on 14 rounds was 11. G7 of 355 runs exact drop as the ab custom curve, both at 2630mv. For shits and gigs, I have a 4dof kestrel too, loaded that up, had to drop form factor from 1.00 to 0.97 for dope to match the AB and G7 drops. So Hornady had a lower ballistic coefficient than the bullets performance.
I don't trust or know the Zeiss S3 6-36 that well, so pulled it and put on my ZCO 527. Took to range this afternoon to foul the clean barrel and zero. Velocity on cold/clean was 2557, round 2 was 2627 and es on these 13 rounds was 15. Here's the paper results. She's a hammer!
Sent one to foul, 4 more. Make adjustment, shot 8 rounds for group avg, moved up and left a tenth and sent one more. Taking it to a match tomorrow. Hope to do well.
Call SPR (Bugholes). They can make one according to exactly what you want.
7 SAUM with Hawkins Hunter Metal and mag. Also works with Accurate 7rd WSM mags.
I haven't weighed it..so I'm not sure.. no mods were needed..accurate mag works..
Newb question. I am coming from an RPR too. Is it normal for the bottom lug to hit the actual mag, and not just the follower? The CDG is sitting in the XYLO chassis.
ARC CDG .223 -AI
ARC Xylo Chassis
TT Diamond SS
26" PVA bbl (Thanks UPS
for your customer service )
ARC CDG .223 -AI
ARC Xylo Chassis
TT Diamond SS
26" PVA bbl (Thanks UPS
for your customer service )Attachments
Newb question. I am coming from an RPR too. Is it normal for the bottom lug to hit the actual mag, and not just the follower? The CDG is sitting in the XYLO chassis.
ARC CDG .223 -AI
ARC Xylo Chassis
TT Diamond SS
26" PVA bbl (Thanks UPS
No. The bolt lug should not be striking the magazine.
Did you insert the rectangular aluminum tab between the action and Xylo chassis when you assembled it? The tab ships with the CDG action.
This is what the tab looks like:
Tab between the action and the chassis, front edge of AICS magazine.
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No, that is not an AW mag, but now you know. I’m not aware of any AW mag capable of feeding .223. At least not yet.
Yep, I just went back and looked at the "Compatibility" tab on ARC's website. For some reason i thought it was saying it was an AW mag. Thanks for the reply and info. Dont want to hijcak this thread!
How's 223 feeding? A lot of reports in this and the other thread that the CRF definitely does not prefer the small cases unless you're running it hard. Even worse with steeper shoulder angles.
Probably a dumb question at this point, but can I run any ARC shouldered barrel on my coup? I'm currently running a non coned prefit barrel off another action that feeds great out of AW and AICS mags. Just want to make sure headspace will be good if I buy a nucleus barrel. Thanks in advance.
Headspace is the same between coned and flat. The cone is for feeding. Run them all you want
Alright so we have 1 good running setup with a special follower, but still a number of guys who have reported “rough” feeding or basically requiring to run the bolt hard to get it to feed.
Just trying to understand if the small 223 cases really are presenting issues more often than not or if it was just growing pains.
Mine feeds ok with an accurate mag.. does not control round feed..just pushes the rounds into the chamber.
The special follower is a 5c print from thingiverse - I’ll track down the link for @Blucas88
Also, we ran a few mags through with a MDT steel 223 mag, and it seemed it run perfect unmodified.
Where did you see all the rough feeding reports? Just curious since I’ve been following this and the build threads and most of the rough feed issues that I recall were specifically related to 223AI, due to the sharper shoulder angle.
The printed follower, if designed right, could help present the cartridge more nose up. I’m also thinking that judicious adjustments of the feed lips could help
Dont think you can just easily adjust 223 mag feed lips. They're polymer, so you'll be permanently modifying them with a dremel or sand paper, don't take too much off!
That was the majority of it. I recall reading at least one straight 223 that had reported issues and I think the rest were AIs. One of the guys I shoot with just got his 223 put together and said the same thing… doesn’t like to be run slow, does much better when running it hard.
I guess the concerning part for me is that I’ve yet to see anyone with a smaller bolt face say they had no issues. You have limited adjustment/mag options when it comes to 223 so that’s a hard sell if there’s a even any question about feeding it.
@BFGDC I messed around with my W3 to get the CDG to drop in last night. It’s a pretty slick combo hey.
Took me about an hour using a file. I like mine nice and neat. I measured the width and height of the trigger hanger to determine how much clearance.
Depth is not the issue and minimal to none need to be taken out. Most of the filing is on the sides. You’ll find there are more materials to remove in the right side vs the left. It’s pretty straight forward here.
Most of the work was messing with the screw. You need a countersink hex screw, and will need to countersink the screw hole in the chassis, and also dremel / file off the head of the screw, to provide sufficient clearance to seat the action.
I finished the raw aluminum with aluminum black. A few wipes was all it took and can’t tell the diff between that and the black anodizing. Looks brand new.
Overall easy and pretty straight forward imo.
I ordered my CDG going 6.5cm for a crossover type slightly leaning more towards comp side. Wanted it to come in around 12#. After a lot of number crunching I’m going with a XLR mg 4.0 with C6, bag rider, thumb rest, ATACR 4-16 in MBrace rings, trigger tech diamond. That puts me at 7.85# without a barrel. Thinking PVA M24 shouldered prefit fluted 24” not sure what that weighs but I’d think that’d put me right at 12#ish. I’d like to be able to do 8 round strings without the barrel walking, M24 contour good or slightly lighter?
Personally I run M24 or fatter but I'm not worried about weight. Here are barrel weights from Bartlein's website, I think they will finish a little lighter than the weights shown in the chart. Based on the chart I think the M24 would work for your intended purpose.
Just assembled my CDG in a MPA BA Comp chassis with a PVA MTU contour 223 barrel. I just finished cycling some 77gr factory ammo through the action. I ran 50 rds through it very slowly where it would just pop up out of the feed lips and then slowly push round into chamber. I had zero issues with all different speeds of cycling the bolt. I ran a few so slow that i watch the bullet slowly go up the feed ramp, pop out of the mag and then slowly into the chamber. Had to adjust the mag latch to get the accurate mag to seat, and also the night vision bridge will not fit with the MTU barrel, but has clearance in forend.
I did a 22" 6CM in Medium Palma from PVA. It's right at 4lbs.
Mine is on a hunting rifle, and I wish I had gone slimmer. The should diameter was still bigger than the wrench flats on a Rugged flash hider.
My CDG barreled action, which consists of short action CDG, TriggerTech, 22” PVA M24 6.5CM barrel, PVA jet blast brake, weighs 7.64 lbs. In a KRG Bravo with two butt pad spacers and the minimalist spigot it weighs 11.45 lbs.
Thanks for the info. By the sounds of things I should be real close to that 12# mark
Got my CDG .223ai out again running some factory Berger ammo in 73 grain. Took it out to 700 with little issues. Everything ran well but this Berger ammo is SLOW.
First group I was aiming at the bullet that was already in the target. This was my best group I have ever shot. 5 rounds almost in one hole. I have gotten some good groups but they are usually clover leafed out.
Second group was going well but for some reason my 2nd shot was the one to the right of the group. Don’t really have a clue what caused that one unless I was sloppy on the gun.
Gun feeds extremely well with regular .223 ammunition but .223 AI you have to run the bolt faster on close.
First group I was aiming at the bullet that was already in the target. This was my best group I have ever shot. 5 rounds almost in one hole. I have gotten some good groups but they are usually clover leafed out.
Second group was going well but for some reason my 2nd shot was the one to the right of the group. Don’t really have a clue what caused that one unless I was sloppy on the gun.
Gun feeds extremely well with regular .223 ammunition but .223 AI you have to run the bolt faster on close.
Attachments
Can confirm that straight 223 is cycling fine. It seems that most of the issues can be attributed to AI shoulders or mag height.
Played with my buddy’s 223 that was having some issues, and it was pretty apparent that the mag latch needed to be adjusted. He had some modified Accurate mags that were sitting too low and had a really bad hitch when the bolt was cycled slowly. An adjustable mag latch/seating the mag higher quickly fixed that.
At that point we tested some modified MDT metal mags as well as some poly mags without issue. There was no discernible difference in feeding or smoothness once the correct mag height was achieved for each.
Played with my buddy’s 223 that was having some issues, and it was pretty apparent that the mag latch needed to be adjusted. He had some modified Accurate mags that were sitting too low and had a really bad hitch when the bolt was cycled slowly. An adjustable mag latch/seating the mag higher quickly fixed that.
At that point we tested some modified MDT metal mags as well as some poly mags without issue. There was no discernible difference in feeding or smoothness once the correct mag height was achieved for each.
What scope ring height are yall using? I should get my rifle in the next week or two and I'm trying to get ahead on ordering rings.
I'll be using a Bushnell XRS3 (34mm tube, 56mm obj), an MPA ESR chassis, and ARC rings. I want to have the scope high enough to use a 1.250" straight barrel, although I have a light Palma contour on order. I'm think the 1.26" rings seem about right, or should I go with the medium 1.10" rings?
I'll be using a Bushnell XRS3 (34mm tube, 56mm obj), an MPA ESR chassis, and ARC rings. I want to have the scope high enough to use a 1.250" straight barrel, although I have a light Palma contour on order. I'm think the 1.26" rings seem about right, or should I go with the medium 1.10" rings?
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