Dang that sucks you had to fix it that way, but I'd probably send it back to Curtis. I'm over 5k rounds on the action, 4 barrels, all hand tight, and haven't had a problem at all.Not worth to start a new thread, but I just wonna let some of you who has problems with Curtis vector with unexplained overpressure, flat primers, and heavy extractor marks even on low powder-charge that I fixed the issue on mine.
Two of my 6.5 cm barrels are set to be hand tight by different smiths and both of my barrels gets the same problem. The problem is that when the barrel is new all of my fired brass measures 1.562-1.563 from base to shoulder datum( virgin brass measures 1.556), when my fired brass from my tikka or my ruger never measures more than 1.560, then I was thinking ok maybe due to its SAMMI chamber and a custom chamber difference, then after 300-500 rounds later I started to have unexplained pressure problems on a mild charge(41.7gr re16 behind 140hybrids), then I dropped the charge to 40.5-41gr same shit! Dropped again to 39.8-40gr and same f**king shit! the brass measures 1.565 after firing and the brass won’t even last more than 3-4 firings before the primer pockets become so loose. Then I took off my barrel clean the hell out of it, tighten the barrel down has tight as I can with my hands. Back to the range did some more testing with 40gr charge in my virgin brass and resulted the same F**king problem! 3-4 rounds fired out of my 10 round shot strings had super heavy bolt lift, flatten primer and heavy extractor mark! at this point I believe that I’m having excessive headspace.
My barrel vice came in today, put my barreled action on the vice, used a channel lock with towels wrapped around the action to tighten it down as much as I can with out marring or damaging my action, shot over 40 rounds of my 40gr charge without a single problem, super easy bolt lift and all primers are as round as it can be. Brass now measures 1.562-1.563 this time after firing, the headspace still a little more than I like, now I’m waiting for my action wrench to come so I can torque it down to 70-90ft lbs and see if I can get another .001-.002 thread crush.
So my theory is that after some amounts of firing, the threads on these actions tends to stretch under pressure, heat and stress, and result in increased headspacing and bolt to face clearances.
Lastly I hope all of you who has problems like me can solve your issues, becuase this is how I got mine fixed.
Have a nice day and will never buy another Curtis action again becuase the quick switch barrel system is not what it advertised to be.
Thank you for you recommendation, as for now seems like the problem has gotten away and I don’t wonna go through the hassle of sending the action and wait. I’m going to torque it down to 70-90ft lb and hopefully that can tighten the headspace another .001-.002 then will do more testing after, if the problem still exist I’m going to call them and troll lol.Dang that sucks you had to fix it that way, but I'd probably send it back to Curtis. I'm over 5k rounds on the action, 4 barrels, all hand tight, and haven't had a problem at all.
Thank you, and I do understand that barrels that cut to be hand tight for the vector has little more headspace, but on mine after few handred rounds it became a little excessive lol, and I’m pretty sure I tighten the set screws over 30inch lbs.Yeah, I would be calling Chase about this. That isn’t right at all. Another thing to think about is your barrel was cut to be hand tight (not torqued) so you will probably still have a little more headspace then you want.
As someone who has this action inbound as well as a barrel... set to be hand tight, I will be monitoring head space consistencies.
I would be interested in hearing if Curtis looks into this for you. With Joel breaking away and starting his own action company, things like this need to be resolved.
I have not. I’ve been waiting to get back out to the range with some virgin brass that lacks any ejector marks. I went from hand tight to torqued. I had totally forgotten about the different tenon specs between hand tight and torqued. At torqued I was running into pressure issues which makes sense (now anyway).Thank you, and I do understand that barrels that cut to be hand tight for the vector has little more headspace, but on mine after few handred rounds it became a little excessive lol, and I’m pretty sure I tighten the set screws over 30inch lbs.
My first barrel was from keystone accuracy, when the problem started I though it was chambering issue, so I bought another barrel from paradigm gunworks and the problem come up again after few hundred rounds, so I highly doubt it’s the smiths, I’m thinking the spec might be a little off on my action receiver during machining.
When the problem existed the rifle still shoot like laser, but I just don’t like my brass to be beaten up or destroyed after 3-4 firings, and I don’t want to bang on my bolt handle to extract a round during a match lol.
Some member have posted on this thread experienced the same problem, have you guys try to call Curtis custom or try to address the issue? I’m willing to hear from your inputs.
Have a nice day!
I absolutely agree with you! Paying premium price for these actions with mediocre features that’s what makes me not happy lol.Another option is to send your action to John @ Keystone. Have him verify the that your action is within spec. If not, you could choose to talk with Curtis about this or have John cut your barrels to your action spec.
Yes, it defeats the feature of what Curtis sold this for, but at least you would have peace of mind.
He is very very reasonable to make these adjustments to barrels as well. Quick turn around as always.Another option is to send your action to John @ Keystone. Have him verify the that your action is within spec. If not, you could choose to talk with Curtis about this or have John cut your barrels to your action spec.
Yes, it defeats the feature of what Curtis sold this for, but at least you would have peace of mind.
Damn, didn't see this. Good eye.
Damn, didn't see this. Good eye.
My fired 6.5 hornady brass comes out at 1.538" (also using the .400" bushing)
I was using the .375 bushing for my measurements. I’ll use the .400 bushing to measure my virgin and fired casings tonight and see how my measurements compare to yours.
Will do thank you sir! I’ll go home take some pictures of the tools I’m using and measurements of the casings tonight.Hope Im not screwing up the trig but: If he were using the .375 bushing it would be a reading .007 longer. .400-.375=.025/2=.0125 of radius per side of brass shoulder .0125*tan(30°)=.0072 so your 1.539+.007=1.546 with a smaller head space bushing.
View attachment 7129949
If we go with the .350 bushing it should read .025*tan(30°)=.014 and 1.539+.014=1.553 so still less than the number he is getting by 9 thousandths.
I think this rules out the headspace bushing selection as the source of error as his are reading over even the smallest hornady bushing.
@702shooter Id like to hear exactly what tools you are using to get this measurement and Id also be curious to know if you have checked it out with a go gauge. Chamber the go gauge, see if it closes. Then add a layer of tape onto the back until it doesnt close anymore and compare the two measurements to see how far over go you actually are.
View attachment 7129954
That’s exactly what I’m thinking it is. Let me do more testing on Thursday to confirm, becuase usually my issue shows up more on 2x-3x fired casings, and for casings that are 3x fired, 20 out of my 50 casings primer pocket will become very loose.I don't think hand tight has anything to do with 702shooter's problems. If the threads had stretched enough to cause more headspace, the shoulder/action face junction would have showed it, ie. there would have been a .002 gap created at that junction. ISounds to me like a headspace issue from the get go and it's only now showing up.
Dont need a set, just a go and some scotch tape is all thats required. Skip the no go and save the extra 30 bucksWill do thank you sir! I’ll go home take some pictures of the tools I’m using and measurements of the casings tonight.
Looks like I have to order a set of go/no-go gauge
When my fired casings were at 1.565 i always bump it back to no less than 1.563. It didn’t help at all..... few of my 4x fired casings had primer came off the casing after firing..... it scared the shit out of me lolSo you guys with longer headspace, why not just set sizer for .001 shoulder bump? That would take care of excessive headspace in reloads. Obviously factory ammo is still gonna be a problem.
I've got an axiom I bought used on here with a keystone 6.5creed. I also sent action to smith and he spun up a 243cutright bart barrel for it. He torqued to 85ft/lbs and go/no go gage was perfect. When I set up sizer die, I used a bump gage that Jay made and set it on .0005-.001" bump. I haven't had trouble yet.
From br, if I ever had a rd that chambered hard, I never shot it into the score group. Those hard clambering rds always shot out from the group
I’m no expert at this, but my theory is that it had too much bolt face to case head clearances, so ones the round fired the casing slammed backwards against the bolt face, also at the same time pressures blows back out from the primer side, it’s pretty much a fails pressure sign.I still don't understand how a long headspace will create high pressure. All factory ammo is well under headspace....
Aw sorry for your buddy that has the same issue. What has he done trying to fix the issue? What was his headspace like? Measurements of casings after fired?I've well underspaced plenty of loads. It has never resulted in heavy pressure. I did read all your posts. The reason I read them is that a buddy had a near identical issue with a Vector. To my knowledge he never really solved it.
His is a long story that I can't keep track of anymore. I'm pretty sure he chalked it up to a particular barrel. I think he's shooting a Dasher thru it now without issue.Aw sorry for your buddy that has the same issue. What has he done trying to fix the issue? What was his headspace like? Measurements of casings after fired?
Well after I heard from you I take my word back on 80% issue fixed, more like 60% now lol, imma keep testing with my 2nd fired casings and see how they go.
Wow didn’t know so many people have issues with Curtis actions..... can’t believe they charge that much for an action that they can’t even keep a good quality control.
Haha I see. Well yea, I will keep everyone posted.His is a long story that I can't keep track of anymore. I'm pretty sure he chalked it up to a particular barrel. I think he's shooting a Dasher thru it now without issue.
Hope you resolve your issue. I'd be interested to hear what you find out.
some pictures of measurements with c375 bushing and d400 bushing, fired casing hand tight vs torqued to 80ft lbs.View attachment 7130975
View attachment 7130976
Not sure if you checked this, but I at least wanted to see the difference.
Same hornady case, deprimed. First is the D400, second is the C375 you are using.
I would think about using the D400, at least when giving numbers to smiths or Curtis, as the D375 would put it out of saami spec for chambering.
Just tossing ideas here... what solvent are you using when cleaning and how often?
Do you buy any chance own a bore scope? There is a really good one on Amazon that I picked up. I’m impressed with the quality of the image given the price.
Teslong Rifle Bore Scope, 0.2inch... https://www.amazon.com/dp/B07TTQF24F?ref=ppx_pop_mob_ap_share
I guess what I’m getting at is... it’s possible that you have a carbon ring causing your pressure issues. The head space you are seeing doesn’t seem that excessive, at least when you are saying primers are falling out.
Again, just throwing out ideas.
I forgot to mention, I did do what you have said prior drilling with brushes hehe.I would wet a patch using boretech and put into the chamber until you just feel resistance ( hitting the lands ) and let it sit for an hour. Then, take a nylon or brass brush and do the same thing... push until you hit resistance then spin the brush for a bit. Now, run some dry patches and see what comes out.
I only use boretech, now. I ran MPro7 for years and thought my barrels were clean, until one patch of boretech ( waiting an hour ) and it came out black.
I size all my casings before I wet tumble with couple drop of dawn and limeshine.Stupid question, but are you cleaning all the case lube off the cases? I've had all kinds of different actions including both Curtis variants and I've never experienced pressure issues relating to an action. All kinds of other things can cause them though.
I have a Proof Research in 6 Creed from Straight Jacket coming to me. Should be here this week. I’ll zero it shortly after and put it to work at a local match in a few weeks.What barrel and caliber you’re going with this action? Let us know how it shoots!
So what was it?Well guys seems like I’ve fixed the issues! Went to the range couple days ago shot 50 rounds with no problem, only 3-5 rounds had slight heavy bolt lift since I was shooting some fast strings and the barrel was pretty hot. Just seated the primers in my 3x fired casings an hour ago and all primer pockets are tight! Again only showed slight ejector marks on the ones that had slight heavy bolt lift but nothing bothers me.