20 BR feeding issue

Discussion in 'Gunsmithing' started by steelshooter, Jun 2, 2011.

  1. steelshooter

    steelshooter Well-Known Member

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    I have just had a Rem 700 rebarrelled from 708 to 20 BR, it doesn't feed from the mag. When the rim of the case being pushed makes it to the shoulder of the case below it, it jumps out loose and is "flicked" into an awkward position. I have shortened the mag by blocking the rear but that has had no effect on this problem. I wonder would a HS Precision detachable mag be a better solution, has anyone got any experience with this?
     
  2. shortgrass

    shortgrass Well-Known Member

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    The BR familiy of cases were designed as bench rest rounds where cartidges are single loaded. You may have better luck feeding from a mag designed to feed the .22-250. The Dashers seem to 'fit' better in those, don't know about the BRs which are a bit shorter.
     

  3. J E Custom

    J E Custom Well-Known Member

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    All of the short fat cases are problematic as far as feeding, and the rails are difficult to
    adjust perfect.

    What I recommend on and short fat case is to find a center feed mag and have it installed.
    the center feed mags hold the round instead of the rails on the action and can be adjusted to
    feed perfectly buy simply bending the top of the mag in or out.

    The other plus to the center feed, is less chance of bullet tip damage because it feeds straight
    into the chamber.

    All of my WSMs and WSSMs have center feed mags and I have no issues with feeding.

    J E CUSTOM
     
  4. steelshooter

    steelshooter Well-Known Member

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    Thanks for the info, you have both given me some food for thought. I will probably try a 22-250 center feed detachable mag, but at around $300 it may have to go on the back burner for a while (the other half just doesn't understand).
     
  5. Texote

    Texote Well-Known Member

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    What bottom metal/magazine system do you recommend

    Thanks
     
  6. steelshooter

    steelshooter Well-Known Member

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    I ended up staying with the factory bottom metal and just tinkered with it until I got it working.
    I spent many hours watching what happened as I closed the bolt and then I'd pull it apart and bend the mag box a little, put it together and repeat the process again. It isn't flawless, but works 90% of the time ( it only fails at the worst moments!).
     
  7. Texote

    Texote Well-Known Member

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    Yea I really want to build that but I have heard of feeding issues so I'm contemplating a 20-250.

    thanks
     
  8. steelshooter

    steelshooter Well-Known Member

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    A 20x47 (6.5x47 Lapua necked down) would be my next pick.
     
  9. Texote

    Texote Well-Known Member

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    May I ask why? I briefly thought of it since I have a bunch of brass already, but not sure. I really like what the br can do

    Thanks
     
  10. steelshooter

    steelshooter Well-Known Member

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    The 20x47 doesn't have the feeding problems that the BR does, I know a bloke with one which feeds reliably and I think it would be easier on throats than the 250.
    The 20BR does everything you need in a 20 cal otherwise. That's the only reason I'd go for the 20x47. In fact, when the throat goes in this barrel I might even get it reamed out to 20x47.
     
  11. marksman66

    marksman66 Well-Known Member

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  12. Texote

    Texote Well-Known Member

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    Oh cool thanks man
     
  13. steelshooter

    steelshooter Well-Known Member

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    Tried that, didn't work. It might be fine for the 6BR but the 20 is much shorter and still jumps loose in the breech.