Consistent Failure To Cycle

BOS1938

BOS1938

Active member
#1) Took my DUV out this weekend, and had a GREAT time! It cycled flawlessly until I reached the final 2 or 3 rounds of the magazine. It would fail to cycle on either round #7 or #8 of the magazine every single time. I'd clear it, and it would cycle the last 2 or 3 rounds just as it should (depending on which round it jammed on). Has anyone else experienced this? Also, if it matters, I am using a Danish magazine at the moment.

#2) Would replacing the magazine spring help? If so, does anyone have experience replacing the spring? Is there a reputable source for purchasing a replacement spring?

As always, thanks for your time and advice.
 
Those magazines are pretty reliable. Frontline has reproduction magazines. It would be worth a try to swap it out. All you do is slide the floor plate off and swap it out and reverse to reassemble. Also take a little rag with gun oil on it and clean the inside of the magazine when you go to put everything back together. Dont soak it, just wipe it down and it will clean it and leave a little oil residue on the walls of the magazine to help keep things moving.
 
daltrey99 said:
Those magazines are pretty reliable. Frontline has reproduction magazines. It would be worth a try to swap it out. All you do is slide the floor plate off and swap it out and reverse to reassemble. Also take a little rag with gun oil on it and clean the inside of the magazine when you go to put everything back together. Dont soak it, just wipe it down and it will clean it and leave a little oil residue on the walls of the magazine to help keep things moving.
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Sweet, I will give it a try. Just thought it was so strange how it failed on the 7th or 8th round every time.
 
daltrey99 said:
Those magazines are pretty reliable. Frontline has reproduction magazines. It would be worth a try to swap it out. All you do is slide the floor plate off and swap it out and reverse to reassemble. Also take a little rag with gun oil on it and clean the inside of the magazine when you go to put everything back together. Dont soak it, just wipe it down and it will clean it and leave a little oil residue on the walls of the magazine to help keep things moving.
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I second what Daltrey99 has suggested.

I might add, a very light coat of RIG, this works very well for this purpose... Try greasing the spring itself, magazine walls, and follower.

I would also ask you, what ammunition are you using?
 
jmanngun said:
I second what Daltrey99 has suggested.

I might add, a very light coat of RIG, this works very well for this purpose... Try greasing the spring itself, magazine walls, and follower.

I would also ask you, what ammunition are you using?
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Absolutely, I will give that a go. I was using 1977 Romanian 8mm.
 
jmanngun said:
Do you use a shooter kit in your rifle that allows for tuning of the gas flow per the ammunition?
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I do indeed, and the smallest orifice that came with. I could maybe try going up a size, but I have it tuned quite well with the smallest orifice.

I figured out how to disassemble the magazine, and gave it a good cleaning yesterday. We'll see how it goes!
 
BOS1938 said:
I do indeed, and the smallest orifice that came with. I could maybe try going up a size, but I have it tuned quite well with the smallest orifice.

I figured out how to disassemble the magazine, and gave it a good cleaning yesterday. We'll see how it goes!
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Whatever keeps the bolt carrier and gas system cycling without slamming the rear housing, that is the way to go!

Sounds like you are aware of the risks with the surplus ammunition then.

Have you tried any PPU 8mm Mauser (198gr FMJ)? It burns very clean and is very consistent.

Let us know! Good luck!
 
jmanngun said:
Whatever keeps the bolt carrier and gas system cycling without slamming the rear housing, that is the way to go!

Sounds like you are aware of the risks with the surplus ammunition then.

Have you tried any PPU 8mm Mauser (198gr FMJ)? It burns very clean and is very consistent.

Let us know! Good luck!
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I agree! Not sure about the risks of the romanian ammo, other than it's corrosive as hell. Good thing I'm OCD about rifle cleaning 😁

Got a good amount of PPU that I'll fire and reload too. I'll let you know, thanks for the help!
 
BOS1938 said:
I am researching good reloading formulas for when I get to that stage. Never done it before, so I will shooting you a PM at some point!
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Sounds good. I dont load to the max. I have some good loads that are punchy and accurate but not maxed out.
 
When you say 'fail to cycle', what stage are you talking about? Failure to feed, extract or eject? Pinpointing that will help us with with diagnosis. Ive got a G43 that does the same thing on the last 2 rounds, mine is a failure to feed. Im still tweaking the gas system though, and my magazine is a cheap repro so Im kinda of chasing 2 issues.
 
BOS1938 said:
I am researching good reloading formulas for when I get to that stage. Never done it before, so I will shooting you a PM at some point!
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8mm mauser is really easy to reload for, just be aware that a lot of the load info out there under SAAMI specs is considerably anemic due to concerns about blowing up Gew88s. I tend to load my rounds pretty light in the first place because I'm cheap and the paper can't tell the difference. Not a problem on the bolt action guns but it can be challenging on the autoloaders. Thankfully the G/K43 is the easiest in that regard because if you've got the shooter's kit you have an adjustable gas system, and can make up for anemic ammo by opening it up a little bit. I wouldn't run my G/K with commercial ammo because I've got it dialed for my loads, so keep that in mind.
 
internet troll said:
When you say 'fail to cycle', what stage are you talking about? Failure to feed, extract or eject? Pinpointing that will help us with with diagnosis. Ive got a G43 that does the same thing on the last 2 rounds, mine is a failure to feed. Im still tweaking the gas system though, and my magazine is a cheap repro so Im kinda of chasing 2 issues.
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Failure to feed on the 7th or 8th round consisntely. I think the gas system is good to go. I did the painters tape test, and the bolt doesn't cycle all the way to the rear and bounce off back.
 
Cyrano4747 said:
8mm mauser is really easy to reload for, just be aware that a lot of the load info out there under SAAMI specs is considerably anemic due to concerns about blowing up Gew88s. I tend to load my rounds pretty light in the first place because I'm cheap and the paper can't tell the difference. Not a problem on the bolt action guns but it can be challenging on the autoloaders. Thankfully the G/K43 is the easiest in that regard because if you've got the shooter's kit you have an adjustable gas system, and can make up for anemic ammo by opening it up a little bit. I wouldn't run my G/K with commercial ammo because I've got it dialed for my loads, so keep that in mind.
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Nice! If you've got time PM me your reload formula, I want to make sure I'm straight when I start reloading
 
BOS1938 said:
Nice! If you've got time PM me your reload formula, I want to make sure I'm straight when I start reloading
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No need to be coy. Dial up your loads responsibly, you're making home made explosives that you're setting off next to your face, I'm not liable if you blow your gun up etc., but I've got no problem posting loads online that work for me.

175gr bullet, 47.0 gr of Varget, whatever random brass and primers I'm using that day (most of my stash of 8mm is a mix of Prvi and HXP .30-06 I converted).

I'll say that it's a fairly accurate load, but it's not an accuracy load in the way that serious reloaders mean the term. I worked it up and found a nice node shooting it out of the K98k I use for 8mm load testing, and it performs pretty well in the guns I shoot it out of, but I'm also shooting out of ex-military rifles using iron sights (well, except the load development K98k, which has a red dot in a non-destructive rear sight mount). More accurate than military ammo at the very least, and I trust it a hell of a lot more.

This load sits right in the middle of the recommended load data. Starting load is 43.0, max is 50.5. I'm pretty sure the max there is compressed as hell and it's probably limited by the bulk of the powder rather than safety, but don't take my word on that.

Varget isn't the perfect powder for, well, anything, but it's a great all-around powder that is good enough for making pretty much any centerfire rifle round you care to name. If you've got specific applications in mind you can absolutely do better using a powder better suited to that particular caliber/barrel length/etc., but it works great for me to just keep a few 8lb jugs of the stuff around and load everything I shoot that isn't black powder or pistols.
 
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