TeedOff Posted May 6, 2017 Share Posted May 6, 2017 So I picked up a CK Arms Hardcore recently. I also have an STI DVC Open which will be moving to backup duty. The CK is very well finished and locks up super tight. As in, when I first tried to rack the slide I was like WTF? I've got about 200 rounds thru it now...it still locks up tight but has become much easier to rack. So far I'm 100% impressed with this gun over the DVC. Here it is: Since I already have one open gun, it seemed logical that I'd want to be able to run the same load in both. You know, in case I need to bring the backup into action...right? What I am seeing is the load that runs great in the DVC is tumbling out of the CK. Actually only about one in three bullets are tumbling. I suppose the obvious answer is work up a load for the CK and take enough of both loads to run a match. Not ideal but doable. For reference, I'm running 6.9 gr of autocomp under MG 124 gr JHP at 1.150". This makes 1416 fps in the DVC and 1410 fps in the CK. Any idea to get the bullets to stop tumbling from the CK? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
aandabooks Posted May 6, 2017 Share Posted May 6, 2017 Try backing off your crimp just a little. Link to comment Share on other sites More sharing options...
TeedOff Posted May 6, 2017 Author Share Posted May 6, 2017 Try backing off your crimp just a little.Thanks Matt...will give that a try. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Sandbagger123 Posted May 6, 2017 Share Posted May 6, 2017 check to see if the comp or the set screws have loosened Link to comment Share on other sites More sharing options...
Aircooled6racer Posted May 6, 2017 Share Posted May 6, 2017 Hello: Check to see if the bullets are hitting the comp. Look for gold colored marks on the port lands. Also check to see if there comp is hitting the end of the slide, cocking the comp up or down. A piece of paper should fit between the slide and the comp when it is locked up. Thanks, Eric Link to comment Share on other sites More sharing options...
nbot Posted May 6, 2017 Share Posted May 6, 2017 Just to learn myself, what do you mean by tumbling? Is that the same as keyholing? Link to comment Share on other sites More sharing options...
al503 Posted May 6, 2017 Share Posted May 6, 2017 (edited) Before backing off the crimp, I'd simply pull a bullet from a loaded round and check the bullet for an indentation where the rim was. You might also do the plunk test. A couple owners are loading at 1.14" so the bullet isn't engaging the rifling in battery. Edited May 6, 2017 by al503 Link to comment Share on other sites More sharing options...
racer-x Posted May 6, 2017 Share Posted May 6, 2017 Definitely do the plunk test to determine how long you can load. I have 2 CK open 9's now and MG124's contact the throat at 1.40-1.145 OAL in both. I load to 1.130 OAL. 6.9 gr WAC @ 1.130 is good for 1410 in my guns as well. You do not want to run loads that start out pressed into the throat - will increase peak pressures. Not sure if this could account for your tumbling? Seems unlikely, but would be easy to find out. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted May 6, 2017 Share Posted May 6, 2017 I'd get that chamber reamed so you can load out to 1.17" ... Even my TruBor will handle 1.17", and I usually load to 1.16". It should Never be that short .... Link to comment Share on other sites More sharing options...
racer-x Posted May 6, 2017 Share Posted May 6, 2017 Still waiting on that PT&G carbide throater... Link to comment Share on other sites More sharing options...
Heckler Posted May 6, 2017 Share Posted May 6, 2017 3 hours ago, racer-x said: I have 2 CK open 9's now and MG124's contact the throat at 1.40-1.145 OAL in both. I load to 1.130 OAL. 6.9 gr WAC @ 1.130 is good for 1410 in my guns as well. You do not want to run loads that start out pressed into the throat - will increase peak pressures. Not sure if this could account for your tumbling? Seems unlikely, but would be easy to find out. Interesting, I have a CK open gun and load my MG124's at 1.165-1.170. Back to the OP, have you tried any other bullets? Link to comment Share on other sites More sharing options...
theWacoKid Posted May 7, 2017 Share Posted May 7, 2017 Fix the comp first. The mount and comp don't come as secure as they should be on CK's. It took a few tries before I got them both loctited rock solid. Using loctite on just my comp's set screws wasn't getting the job done. Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 On 5/6/2017 at 10:05 AM, Sandbagger123 said: check to see if the comp or the set screws have loosened This is not the case. Comp is on tight and the screws are tight. Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 On 5/6/2017 at 10:13 AM, Aircooled6racer said: Hello: Check to see if the bullets are hitting the comp. Look for gold colored marks on the port lands. Also check to see if there comp is hitting the end of the slide, cocking the comp up or down. A piece of paper should fit between the slide and the comp when it is locked up. Thanks, Eric I see no evidence of bullets hitting the comp. The gun locks up very tight...I can put a piece of paper in between the comp and the end of the slide and then let the slide close, if that's what you meant? Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 On 5/6/2017 at 1:15 PM, nbot said: Just to learn myself, what do you mean by tumbling? Is that the same as keyholing? Yes, same thing, sorry if I used the wrong word. Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 On 5/6/2017 at 2:15 PM, al503 said: Before backing off the crimp, I'd simply pull a bullet from a loaded round and check the bullet for an indentation where the rim was. You might also do the plunk test. A couple owners are loading at 1.14" so the bullet isn't engaging the rifling in battery. The pulled bullet does not show a crease where the case rim is, so I do not believe it is over crimped. I did some plunk testing and it seems the throat is VERY short...longest COAL I could get to plunk is 1.104". This is with Montana Gold 124 gr JHP. I have some Precision Delta 124 JHP that I could try as well. Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 On 5/6/2017 at 2:33 PM, racer-x said: Definitely do the plunk test to determine how long you can load. I have 2 CK open 9's now and MG124's contact the throat at 1.40-1.145 OAL in both. I load to 1.130 OAL. 6.9 gr WAC @ 1.130 is good for 1410 in my guns as well. You do not want to run loads that start out pressed into the throat - will increase peak pressures. Not sure if this could account for your tumbling? Seems unlikely, but would be easy to find out. The longest COAL that will plunk is 1.104". I too am running 6.9 gr WAC @ 1410. I am hesitant to load to 1.104" at this power factor...seems that would spike the chamber pressure. Link to comment Share on other sites More sharing options...
aandabooks Posted May 7, 2017 Share Posted May 7, 2017 4 minutes ago, TeedOff said: The pulled bullet does not show a crease where the case rim is, so I do not believe it is over crimped. I did some plunk testing and it seems the throat is VERY short...longest COAL I could get to plunk is 1.104". This is with Montana Gold 124 gr JHP. I have some Precision Delta 124 JHP that I could try as well. That seems really short. Not going to leave much case capacity pushing the bullet in that far. Link to comment Share on other sites More sharing options...
TeedOff Posted May 7, 2017 Author Share Posted May 7, 2017 Just now, aandabooks said: That seems really short. Not going to leave much case capacity pushing the bullet in that far. Yeah, that's what I'm thinking. Seems like I need to get the throat reamed. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted May 7, 2017 Share Posted May 7, 2017 Hello: Give Matt a call he will make it right. Thanks, Eric Link to comment Share on other sites More sharing options...
nbot Posted May 7, 2017 Share Posted May 7, 2017 2 hours ago, TeedOff said: Yeah, that's what I'm thinking. Seems like I need to get the throat reamed. CK Guns seems to come with very short throats! Link to comment Share on other sites More sharing options...
BeerBaron Posted May 8, 2017 Share Posted May 8, 2017 good news is your barrel is not TiN coated so at least it should be easy to ream... Link to comment Share on other sites More sharing options...
TeedOff Posted May 10, 2017 Author Share Posted May 10, 2017 good news is your barrel is not TiN coated so at least it should be easy to ream...Yes. I reached out to Matt Cheely... he will take care of it. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
lcs Posted May 10, 2017 Share Posted May 10, 2017 On 5/7/2017 at 7:51 PM, nbot said: CK Guns seems to come with very short throats! and that makes no sense to me. 9 major is always loaded long. The sweet spot is around 1.165 OAL Link to comment Share on other sites More sharing options...
nbot Posted May 10, 2017 Share Posted May 10, 2017 and that makes no sense to me. 9 major is always loaded long. The sweet spot is around 1.165 OAL Absolutely agree. At least with a 115 bullet They're super short for 147s at 1.17Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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