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Thread: Controlled Round Feed

  1. #1
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    Controlled Round Feed

    I have an FN Mauser 98 large ring action which has CRF. It is chambered in .270 Win. I would like to build the gun into a long-range rifle capable of precision shooting.

    My first possible problem arose when thinking about the CRF requiring magazine insertion of the rounds. I want to re-chamber the rifle in .280 Remington so that I could use the 180 Bergers. However, I suspect that these will not fit into the magazine when loaded long onto the lands. Since the CRF mechanism on the bolt head acts to extract the shell, I'm not sure if anything can be done to remove it and still extract the rounds.

    I'm seeking any suggestions on what route I could take continuing the build properly for long-range shooting.

    Thanks

  2. #2
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    CRF doesn't require a magazine to feed. Mauser themselves made a single shot action way back. It had a solid bottom which had a slight inclining ramp cut along where the magazine would normally fit. See Frank de Hass's book on bolt action rifles.

    You could dispense with the magazine entirely & fill in the cutout in the stock, finishing it with a ramped feeder similar to Mauser's original design.

  3. #3
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    If you are familiar with this action, and say that it is possible to feed without the magazine, then I am confused.

    There is the rim catch on the right side, which rotates on the exterior of the bolt. The rim catch effectively blocks a portion of the bolt face if viewed from the front. The round has to slide up from underneath in order for the rim catch to slide into the rim groove. If I put a round into the chamber and close the bolt, the bolt will not rotate or close, since the rim catch will not be over the cartridge base, but butting against it. Is there something that I am missing here?

  4. #4
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    You can shoot it single shot with a little mod of the extractor to allow it to slide over the rim.
    Butch

  5. #5
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    Quote Originally Posted by Butch Lambert View Post
    You can shoot it single shot with a little mod of the extractor to allow it to slide over the rim.
    Butch
    Can you explain any more about this?

    I can see where a spring loaded extractor will snap over the rim. But this extractor does not move outward any, it only rotates. What I'm getting at is, if you ground it open so that it would not block the bolt face, then it would no longer extract either.

  6. #6
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    Mirage,
    You might pose that question on www.accuratereloading forum. Go to the gunsmithing forum and pose the question. It has been done many times. If you wish I will ask and get back to you. If Jim Kobe, Dennis Sorensen, or Bill Leeper see this I am sure they can help you.
    Butch

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  8. #8
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    Thank you for starting a thread there.

  9. #9
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    Looks like you are getting a little response over there.
    Butch

  10. #10
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    Mirage 416,
    Did you get the answers or can I do more digging for you?
    Butch

  11. #11
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    I have been reading the thread, and noticed the last post about a MK X extractor. I can't seem to turn anything up in a search, though. I imagine my best bet is probably to find one of those extractors, so it will be cut just right and ready to go.

    Any guesses on who might have one of those extractors available?

    Thanks again for your help on this Butch.

  12. #12
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    Wink Jim Wisener......

    Precise Metalsmithing, in Washington State; you'll have to do some digging, though, I don't have a current #. Good quality at a fair price, just what you need.

  13. #13
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    Quote Originally Posted by Butch Lambert View Post
    Mirage,
    You might pose that question on www.accuratereloading forum. Go to the gunsmithing forum and pose the question. It has been done many times. If you wish I will ask and get back to you. If Jim Kobe, Dennis Sorensen, or Bill Leeper see this I am sure they can help you.
    Butch
    Butch, doesn't the Mauser feed like the Pre64 Win actions? My hunting rifle is a Win Classic SS 7remmag. It has the drop down plate, not a magazine. However, Winchester plainly states to insert the round completely into the magazine plate so the case is picked up by the controlled feed every time.

    When I first started deer hunting, I asked AC Burgess what to get, no restrictions. He said either the Sendero or the Win, and was having more luck with the Win actions. He basically bedded & floated, set the headspace, jewelled the action, lightened the trigger to 3.5 and installed a muzzle break.
    He also lapped & fitted the Leupold 6 x 18.

    After I found the pet handload, it shoots one hole at 100, and holds sub moa to 400 yards, UNLESS I forget to feed it through the mag, and then it goes PLUS moa at 100.

    If he could put in a hinged floor plate, to insure the controlled feed funtion worked, do you think he would have a nice solid action?

    As you can see, I know very little about Mausers. I do have a rusted up Mauser action that can easily be saved. Whats you thought on building a centerfire competition rifle on it? I sure would hate to go to that trouble & expense and have a rifle that won't shoot as well as my hunting rifle!

  14. #14
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    Quote Originally Posted by geneinnc View Post
    ...it shoots one hole at 100, and holds sub moa to 400 yards, UNLESS I forget to feed it through the mag, and then it goes PLUS moa at 100.
    What is happening when you forget to feed it through the mag that makes accuracy decrease?

    I would have posted some close-up photos, but my digital camera sensor seems to have bit the dust.

    Here is the best way to describe the bolt face and extractor. Picture a shell holder, with one side of the lip opened up. This means without modification, the round will not go in from the front, only the side.

  15. #15
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    Quote Originally Posted by Mirage416 View Post
    This means without modification, the round will not go in from the front, only the side.
    That's the bottom when the bolt's coming forward, isn't it?

    Here in Australia, we single shotted hundreds of Mausers & M17s for TR shooting (Palma) & all that was needed to feed behind the extractor was a replica of the original Mauser single shot ramp - much the same as the Brownell ramp shown on the other web site. If you don't provide a slope, either by feeding off a magazine or a ramp, then you'll drive the round into the top of the chamber.

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