Ringed chamber question

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  • Last Post 12 May 2025
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Ross Smith posted this 01 May 2025

A friend has a marlin 99 with a ringed chamber. Shots fine but a cleaning rod and hammer are needed to extract the cartridge. My question is: Is the reciever also damaged? or is rebarreling a good option. I think I can pick this up real cheap.

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sandwman posted this 02 May 2025

The receiver is probably not damaged and a re-barreling is not out of the question.

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4and1 posted this 02 May 2025

I agree, the only solution is to rechamber the barrel, or a new barrel. 

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Ross Smith posted this 02 May 2025

Thanks, 

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Ed Harris posted this 02 May 2025

Rechambering will not clean up the ringed chamber. Look for a replacement barrel or reline.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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Waleone posted this 02 May 2025

What would you rechamber a .22 LR to anyway?

Wayne

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John Carlson posted this 02 May 2025

22 Mag?

John Carlson. CBA Director of Military Competition.

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Waleone posted this 03 May 2025

John, could be a bit of a challenge working with a tube magazine, the increased cartridge length in a semi auto and increased pressure of the RFM. I’m also not sure if you could shorten the barrel and rechamber in LR with the magazine lug on the barrel. The Marlin 99 was the predecessor of the model 60. If the barrel mounting was the same, model 60 barrels should be obtainable. Maybe Numerich?

Wayne

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MP1886 posted this 03 May 2025

Nope 22 Mag is OUT.  It's not a simple thing of length of the 22 Mag, it's the increased power and pressure. Ruger tried to make a 22 Mag on their 10/22 and falied even after making the bolt out of tungsten. The Mag requires a whole different engineering setup on a semi-auto, not on say a bolt action. 

Find a replacement barrel. Here are barrels for the Model 99 on Numrich, go for the used one it's cheaper:

https://www.gunpartscorp.com/gun-manufacturer/marlinglenfield/rifles-marlin/99

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tomme boy posted this 03 May 2025

22 mag runs at the exact same pressure as a regular 22rf. This is another thing people get wrong all the time. It just has more powder to burn over a longer time to increase the speeds. 

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MP1886 posted this 04 May 2025

22 mag runs at the exact same pressure as a regular 22rf. This is another thing people get wrong all the time. It just has more powder to burn over a longer time to increase the speeds. 

 You tell me how a 22 magnum which has far more powder then a 22LR that can push a "jacketed bullet which has more friction then lr's soft lead alloy" at a much higher velocity?

Why is .22 Magnum Hard to Make in Semi-Auto?

The .22 Winchester Magnum Rimfire (.22 WMR), often called the .22 Magnum, presents a significant challenge for reliable semi-automatic operation primarily due to its high pressure and rimfire ignition coupled with the geometry of the cartridge. These factors create a delicate balancing act for designers aiming to cycle the action reliably without damaging the firearm or encountering excessive malfunctions. Specifically, the combination of high bolt thrust, thin-walled rimfire case, and precise timing requirements makes it far more difficult to design a robust and reliable semi-automatic .22 Magnum than centerfire cartridges of similar power.

The Core Challenges Explained

1. High Pressure and Bolt Thrust

The .22 Magnum is significantly more powerful than the .22 Long Rifle (.22 LR). This increased power translates directly into higher chamber pressures and greater bolt thrust. Bolt thrust refers to the force exerted on the bolt face by the expanding gases after firing. In a semi-automatic firearm, this force is used to unlock the bolt and cycle the action. However, the .22 Magnum’s high pressure creates a much larger force that needs to be managed carefully.

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Ross Smith posted this 04 May 2025

very interesting MP.

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MP1886 posted this 04 May 2025

very interesting MP.

Ross SAAMI recently changed their pressure for the 22 Mag and 22 LR.  It use to be 24K for both. Now it runs anywhere from 26 to 30 K

Ruger tried everything they could to make their 10/22 a 22 magnum. The bolt was getting blasted back too fast and hard. Their last resort was to make the bolt from Tungsten which is very heavy metal. The didn't do it so they gave up. 

My best friend knows Volquartzen. I believe he made a 22 mag semi auto. I want to talk to him and see what the problem getting them to work is and why a 22 mag beats a semi auto rifle to death such as the Ruger 10/22, but the 22lr does not. Why did Ruger try to put a heavier tungsten bolt on their 10/22 if the 22 mag and 22lr run at the same EXACT pressure?

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Aaron posted this 04 May 2025

AMT made the Automag pistol in 22 mag. It runs just fine. They were very expensive.

 

 

With rifle in hand, I confidently go forth into the darkness.

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linoww posted this 05 May 2025

I had an AMT 22 mag. and it ran fine but I sold it as it was expensive to feed.I wish I still had it

"if it was easy we'd let women do it" don't tell my wife I said that!

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MP1886 posted this 05 May 2025

AMT made the Automag pistol in 22 mag. It runs just fine. They were very expensive.

 

 Those where just an ordinary blowback operated semi auto Aaron. They had an unique gas ports in the chamber.  AMT also made a 30 Carbine version. If it were just a blowback it would wreck the pistol.  When AMT came out early with one of the first 1911's in stainless they had a severe galling problems, let to the demise of the gun. 

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Ross Smith posted this 05 May 2025

I mispoke. I meant Savage 99. The replies have been very interesting though.

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MP1886 posted this 05 May 2025

Aaron,

This model uses a "gas system" built into the barrel chamber which consists of 18 connecting holes that routes pressure around the case/shell. Do not use grease or heavy oil in the chamber, some have clogged the system while trying to polish the chamber. Always use ball powder ammo not flakes style as they clog the gas system.

From what I've heard they were problematic in functioning. If you haven't had problems with yours I'd say you are lucky Aaron. I hope it continues so. 

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MP1886 posted this 05 May 2025

Tommeboy,

I was talking to Scott Volquartzen today. Volquartzen is a very innovative company. They also make top notch firearms. I'm sure you are aware of their work with the 10/22. In fact they were so good that Bill Ruger was going to put them in charge of their custom shop, but Bill passed before that happened. 

Anyways, as I've said, I was talking to him today. He said, as I've said to you, don't believe SAAMI. The 22 magnum has more pressure then the the 22lr. Think about it, why would, or how could, the 22lr and 22 magnum have the same pressure?

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RicinYakima posted this 05 May 2025

A friend has a marlin 99 with a ringed chamber. Shots fine but a cleaning rod and hammer are needed to extract the cartridge. My question is: Is the reciever also damaged? or is rebarreling a good option. I think I can pick this up real cheap.

 

Savage 99 is not hard to rebarrel, but case must be same body as original to work in the magazine. i. e. 30/30 or 308 Win. and you still may need to find another spool. 

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Ross Smith posted this 06 May 2025

I gave up on the idea when I dug into what would be needed. Not a cheap way for a new gun. It was a 243 and rebarreled to 284 something.

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