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Thread: Bolt won't fully close.

  1. #11
    XCR Guru Merlin's Avatar
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    Re: Bolt won't fully close.

    Before reaming the chamber try some good factory or surplus ammo if you can. XCR's generally do not require reaming, they have benefited from honing though, which as you may know if less radical. The M's have been pretty good so far with the chambers Not requiring honing, so unless QA has changed lately for them I would do that as the last resort.

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  2. #12
    XCR Guru Sean K.'s Avatar
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    Re: Bolt won't fully close.

    Quote Originally Posted by Merlin View Post
    Before reaming the chamber try some good factory or surplus ammo if you can. XCR's generally do not require reaming, they have benefited from honing though, which as you may know if less radical. The M's have been pretty good so far with the chambers Not requiring honing, so unless QA has changed lately for them I would do that as the last resort.
    Most of the lack of need for honing is b/c most bbls have been SS so far for the M....so there's no "after coating" of chrome lining.....meaning the bore/chamber is drilled/reamed true to size rather than oversized.

    That's the big advantage to nitriding over chrome lining as well....too bad RA can't see to figure out how to nitride a bbl.
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  3. #13
    Carbineman blukownaz's Avatar
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    Re: Bolt won't fully close.

    I realize that the cases look like the culprit, but check to make sure your bullet tip is not prematurely hitting the rifling.

    Different bullets have ogive differences that may hit the rifling lead independent of OAL.

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  5. #14
    Newbie TRPAUBREY's Avatar
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    Re: Bolt won't fully close.

    That is also a good point, thanks. I will say that when I load for my bolt gun I always measure to the ogive but did not concider that for the semi auto. I guess I assumed that going with a 2.80 OAL should leave me lots of room. I will check that too.

    thanks

  6. #15
    Rifleman Quiet Man's Avatar
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    Re: Bolt won't fully close.

    I don't mean to ask a silly question, but are you sure the brass is 7.62 x 51 and not 7.62 x 54?

  7. #16
    XCR Guru MickeyC's Avatar
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    Re: Bolt won't fully close.

    7.62 x 54 is rimmed brass.
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  8. #17
    Rifleman AlaskaGuns's Avatar
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    Re: Bolt won't fully close.

    I'm an avid reloader as well, and I was having very similar issues when I started out. The problem went away when I switched over to small-base dies. As long as you don't run your loads on the "hot" end, and use good brass, I've gotten 15~20 loads per brass. However, when I hit the 5 loads mark, I run a small pick inside the case to make sure I'm not going to have an edge which is a sign of the cases becoming thin and separation can occur.

  9. #18
    Newbie xcrbob's Avatar
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    I bought a used M from a guy that admitted it went back to where purchased and they fixed the problem with a magazine swap. Bollocks, I did a chamber cast and the chamber had great throat and rifling lead-in. I disassembled the bolt for use with a head space gauge and found it could not be closed on a "go" gauge. So a tight chamber (minimum dimensions) usually a good thing was terrible with my reloads. Seems my reloads were not as perfectly sized as I thought they were. Cartridge gauges and head space gauges are great items to have, I still had to use them right . Still my chamber was tight and I did do a bit of shoulder tweaking with a pull-through 308 reamer, glad barrel was stainless as chrome would have been just messed up. Rifle shoots like a dream now, with brass anyhow, I dont use any steel case. I found a good deal on some 308 sb dies, i have been using sb in 223 forever and I think with semis in particular....probably a better way to go. Have big safe fun with your rifle, they are great.

  10. #19
    XCR Guru Bravo's Avatar
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    Yup, I have to size my brass to between -0.002 and -0.003 to get the rounds to chamber without any camming force required on the bolt.
    I can fire rounds that are sized to exactly SAAMI spec, but they require some camming force to do so - they don't malf though.
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  11. #20
    Marksman Devil doc's Avatar
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    I'm running into the same issue using Dillon dies.
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