Magazine Spring Issue???

gt_diesel

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I have been doing some feeding tests on my new CZ 550 in 500 Jeffery... This is what I have found. Testing was using Nosler Safari Ammo (Nickel Plated / 570 Grain Solid)

If I put three rounds in the magazine, the gun seems to feed fine most of the time... On occasion I have had the tip of the round raise too high, contacting above the chamber. This happens more when cycled slowly. Quick cycling seems to not give the nose to raise as high.

The second issue seems to occur almost every time. When loading three rounds with an empty chamber. When cycling the bolt to chamber the first round, it will eject that top round from the magazine.

The third issue which happened once, is with two in the magazine, one in the chamber. Upon cycling to eject the first round, the second round will also eject.

My observations with this is that the spring seems to be weaker than what I have had previously with my old 416 Rigby. I am unsure if this can be the cause of the problem.

I have also noted that on occasion when loading rounds into the magazine, one will occasionally “pop out”.... It seems to be that the spring is either not holding the round tightly enough to the top of the magazine, or it is opened up too much and not allowing a good seating position for that top round.

I am aware that people have had issues with the nickel plated ammo, I have yet to try any of my standard brass case ammo.

I did email the CZ custom shop to see what the issue may be.

Any options or advice would be great. I am not a huge fan of sending stuff out if it is as simple as a spring issue.

Thanks!
 
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CTDolan

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First, as you mention, try brass. If this solves the problem with rounds popping out of the magazine, you can then address the other issue with the nose of the bullet contacting the edge of the chamber. Likely, brass cases will make this problem (rounds jamming on the edge of chamber) worse but at least then you'll not have competing issues to address (wanting a round to leave earlier so as to line up with the chamber better, all the while not popping out prematurely).
 

gt_diesel

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The nickel plated actually seem to be coming out too early as they are hitting the top of the chamber, not the bottom.

I will try the brass when I get home and will also rough up the nickel to see if that solves the problem.

Thanks!
 

gt_diesel

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After speaking with Harlan at Triple River, he said the rails need to be undercut.

The good part is it’s warranty work... The bad is that I have to take the time to pack it up, send it and be without it for a few weeks.
 

colorado

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I would have Harlan also machine the magazine follower to better fit the fat 500 Jeffery case. My guess is it's machined for the 416 / 450 Rigby case. That was the final fix for my my CZ 550 in 500 Jeffery. Say hello to Harlan for me. If you want I can post a picture of my follower.
 

colorado

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Ok here's a picture of my magazine follower you can see where it was machined to make it a bit fatter towards the rear. Kevin Weaver, my local gunsmith did it. I had Harlan and then Wayne at AHR work on my rifle and they got it close. This was the finishing touch. It feeds and functions flawlessly thanks to the work of all three awesome gunsmiths. The 500 Jeffery is not an easy cartridge, but it's an awesome one.

My follower:

StFbqK7.jpg


My rifle

full
 

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Nhoro

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Hi gt_diesel,
I have spent a few hours(maybe days) getting CZ 550 to feed properly, you can read my story at https://www.africahunting.com/posts/507417/.
My advice to you is to take it to a good gunsmith. 500 Jeffrey is notoriously hard to get to feed reliably. IMHO it is a bit fat for CZ actions. From your description, the magazine box sounds a little narrow. Sometimes recoil causes the magazine box to bend inwards and the rounds pop out as you describe. You can see this by eye and simply bend the magazine box side outwards If it is the BOX. If it is the reciever part of the magazine (ie just under the rails then take it to a good gunsmith)
Undercutting the rails in essence widens the receiver, just under the rails and allows the rounds to sit wider. This means the spring tension of the magazine follower pushes rounds outwards against the sides of the magazine and rails instead of up and out of the magazine.See Von Gruffs post on correct mauser magazine dimensions. That explains in detail. Then when the receiver is correct, a gunsmith will tune the rails to get the round to release at the right time and will adjust the ramp to stop the nose from bumping. Bottom line, take it to a good smith cos the DIY solution is a load of work and a misstep results in a mess.
 

gt_diesel

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Thanks guys, it is going out to Harlan at triple River this week. If that dosnt solve the problem, my next step is the AHR improvements.
 

Shootist43

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gt_diesel, send Harlan (and his daughter) several inert rounds to function through your rifle. BTW they fixed my 404 Jeffery that had similar feeding problems.
 

Philip Glass

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I have been doing some feeding tests on my new CZ 550 in 500 Jeffery... This is what I have found. Testing was using Nosler Safari Ammo (Nickel Plated / 570 Grain Solid)

If I put three rounds in the magazine, the gun seems to feed fine most of the time... On occasion I have had the tip of the round raise too high, contacting above the chamber. This happens more when cycled slowly. Quick cycling seems to not give the nose to raise as high.

The second issue seems to occur almost every time. When loading three rounds with an empty chamber. When cycling the bolt to chamber the first round, it will eject that top round from the magazine.

The third issue which happened once, is with two in the magazine, one in the chamber. Upon cycling to eject the first round, the second round will also eject.

My observations with this is that the spring seems to be weaker than what I have had previously with my old 416 Rigby. I am unsure if this can be the cause of the problem.

I have also noted that on occasion when loading rounds into the magazine, one will occasionally “pop out”.... It seems to be that the spring is either not holding the round tightly enough to the top of the magazine, or it is opened up too much and not allowing a good seating position for that top round.

I am aware that people have had issues with the nickel plated ammo, I have yet to try any of my standard brass case ammo.

I did email the CZ custom shop to see what the issue may be.

Any options or advice would be great. I am not a huge fan of sending stuff out if it is as simple as a spring issue.

Thanks!
I have had similar problems with my Rugers (.416&.375). Especially the ejecting a spent round hard and the second round popping out. I took them to Matt at Hill Country Rifles who accurized them and had some work done. He did replace the mag spring and I’m hoping that will help. Seems to be more problems with solids.
One thing is for sure a DG gun has to be put through some hard testing and must function all the time to have any value as a DG gun.
Best of luck and keep us posted.
Philip
 

colorado

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Agree my test is to run 100 dummy rounds through it, fast, slow, upside down. If it doesn't pass it needs more work. Of course shoot it a lot offhand at the range too. I have about 400 rounds through my 500 Jeffery. Only two on game, both as you would expect on North American game were one shot kills.
 

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