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Thread: Tricky chambering the 2nd round in a .308

  1. #1

    Tricky chambering the 2nd round in a .308

    Hi chaps,
    I picked up a 1987 ZKK601 .308 last week and finally got out to try it on Tuesday. Only issue I have is if I load 3 rounds, the 1st is quite tight to chamber, the 2nd takes a bit of effort and sometimes jams at an angle when pushing forward if I'm not forceful enough, and the third chambers perfectly.

    If I single load then it chambers spot on every time. If I put 2 rounds in the one on the left looking down struggles to chamber ok.

    I compared it to my mates newer Howa .204 and his has to slots either side of the raceways that seem to help the rounds clear each other when loading. The Brno doesn't have one on the left side looking down which is where the round gets a bit 'stuck'!

    Also it seems like the spring that pushes the rounds upwards is quite taught. If it's exerting too much pressure from below could this be the reason the 1st of the 3 rounds is difficult to load. This should be an easy tweak but I don't want to weaken it if it unlikely to make a difference.

    Here's some pics, although they are not as clear as I thought!

    Brno 308 with the straight raceway on the left



    Howa .204 with the cut out



    Any ideas please?

    Cheers
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  2. #2
    a) wrong spring
    or
    b) too much spring tension
    or
    c) mag designed for a different case?

    start at B!
    depending on spring design you can take some of the pressure off by crimping the last bend of the spring with some pliers
    little at a time trial and error

    you want it to have enough to lift 3 rounds but be slack enough that they are not forced so hard that chambering is an issue
    comparing different actions won't help, they all have little design features that won't be relevant on others

    to be honest though if this was a shop sale get them to fix it

    ​or shoot like you only have one round!

  3. #3
    ZKK 601 is heavily Mauser derived so firstly make sure that the feed lips are smooth and not rough of have been dinged up somehow.

    I seem to recall this rifle has had little use. Mine was a bit rougher feeling as it came out of the box but a bit of use and a touch with a fine stone to make sure it was bur free solved it. Then remember it's a 98 Mauser derived action and use it not baby it. It's got no placky bits like some rifles so there is no need to treat it with kid gloves.

  4. #4
    + 1 with Brit's comments, they are designed to be safe and work in a hurry. Also drop out the spring and follower and clean the inside of the magazine and the sides of the follower. If there is some dirt holding things up it may not rise cleanly and the second round is not presented cleanly.

    David.

  5. #5
    Quote Originally Posted by stratts View Post
    Hi chaps,
    I picked up a 1987 ZKK601 .308 last week and finally got out to try it on Tuesday. Only issue I have is if I load 3 rounds, the 1st is quite tight to chamber, the 2nd takes a bit of effort and sometimes jams at an angle when pushing forward if I'm not forceful enough, and the third chambers perfectly.

    If I single load then it chambers spot on every time. If I put 2 rounds in the one on the left looking down struggles to chamber ok.

    I compared it to my mates newer Howa .204 and his has to slots either side of the raceways that seem to help the rounds clear each other when loading. The Brno doesn't have one on the left side looking down which is where the round gets a bit 'stuck'!

    Also it seems like the spring that pushes the rounds upwards is quite taught. If it's exerting too much pressure from below could this be the reason the 1st of the 3 rounds is difficult to load. This should be an easy tweak but I don't want to weaken it if it unlikely to make a difference.

    Here's some pics, although they are not as clear as I thought!

    Brno 308 with the straight raceway on the left ....... Howa .204 with the cut out

    Any ideas please?

    Cheers

    Obviously it's never had a lesson. You're comparing a controlled-feed action with a push-feed action, and each works in a different way.

    I think the tautness isn't down to a fierce Z-spring but to the follower 'binding'. The RHS cartridge is feeding, but the LHS is not. The follower should have lateral play, and also oscillate around the end of the spring within the well - the floor should 'pitch' in all directions beneath the cartridge. I think that's what you're saying by wider 'slots' on the Howa action.

    The BRNO 601 has a staggered box magazine so the walls are of pressed steel - maybe there's a buckled section which is blocking free side-to-side movement & impeding the upthrust of the floorplate/follower..... or the walls are crusted up as Kalahari says?
    If I'm going to be accused of it then it's just as well I did it.

  6. #6
    Thanks chaps gives me something to go with for starters!!

    Massive lesson learnt though with this rifle is I will NEVER buy anything again from far away without the chance to collect it in person and check it out!!
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  7. #7
    Some of my best rifles were purchases with quirky 'habits' that I fixed. If you can get them, order a magazine and follower. The wrong follower in place can really gun up feeding.~Muir

  8. #8
    Quote Originally Posted by stratts View Post
    Thanks chaps gives me something to go with for starters!!

    Massive lesson learnt though with this rifle is I will NEVER buy anything again from far away without the chance to collect it in person and check it out!!
    Stratts it may be something simple. Just remember that alot of different things out in the big bad arent perfect either new or used. Why? Because a human made it and lets face it we aint perfect although we all perhaps like to think it. Ive only ever bought a handlefull of rifles face to face. Even they were "looks in good nick" and alot of trust in the seller. Now out of the distant buys Ive had 1 which gave me a prob (browning) But it was a manufacturing flaw a quick diy job and sorted. A bit different from yours mine wouldnt cycle at all from the mag. All that was needed was a little bend at the top to present the round at a better angle.


    Keep your chin up mate

    nutty

  9. #9
    Don't worry mate I know anything can be sorted and I quite like things like this as it means I learn all about the rifles while I'm at it. I'm a bit of a tinkerer at heart and love to get things into bits as long as they go back together!

    I'm also dead chuffed because the rifle also likes the Prvi rounds and I put a 5 shot group within 30mm at 100yds again 1st time I shot it!!

    I noticed the bolt is not as smooth running along the raceways and generally it looks like it's all not very worn, so maybe it just needs using. Would it hurt lapping the raceways with some 600 grit?
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  10. #10
    Quote Originally Posted by stratts View Post
    Don't worry mate I know anything can be sorted and I quite like things like this as it means I learn all about the rifles while I'm at it. I'm a bit of a tinkerer at heart and love to get things into bits as long as they go back together!

    I'm also dead chuffed because the rifle also likes the Prvi rounds and I put a 5 shot group within 30mm at 100yds again 1st time I shot it!!

    I noticed the bolt is not as smooth running along the raceways and generally it looks like it's all not very worn, so maybe it just needs using. Would it hurt lapping the raceways with some 600 grit?
    I wouldn't. Let wear in. My CZ Hornet was a bit 'gritty' when I bought it, after 500 rounds it was gone.~Muir

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