.223 chambering problem

Discussion in 'Ammunition & Reloading' started by Dan308, Feb 11, 2013.

  1. Dan308

    Dan308 New Member

    290
    0
    0
    Ok, I've been reloading for a long time and just ran into a problem. I have 2 new Rockriver AR-15 and made up some reloads for them. I went out to shoot and one chambered and fired a 30rnd mag. The other would not close the bolt on the same ammo. I had to pry it out. I took each reload and when dropped into the chamber would not go all the way in. I dropped the same reloads in my bolt action .223 and it fit like a glove. Some old Lake City mil surp chambered also.

    Question, I full length resized all the cases and they were once fired Lake City. Headspace problem? Small base problem? Tight chamber problem? what?
     
  2. locutus

    locutus Well-Known Member Supporter

    16,393
    244
    63
    Tight chamber.

    There is a "tolerance" in chambers. If that particular chamber was cut with a well worn chamber reamer, just before they replaced it, it could be just barely in tolerance.

    If it were mine, I would contact RRA and ask if they would be willing to re-cut the chamber. (But don't tell them you reload:D)

    The other alternative is a small base resizing die. That's the less expensive short term fix, but it may shorten brass life in your other rifles.
     

  3. canebrake

    canebrake New Member

    21,833
    2
    0
    Is the problem RRA chambered for the .223 Wylde?

    5.56×45 NATO Chamber OAL: 2.550″
    .223 SAAMI Chamber OAL: 2.410″
    Wylde Chamber OAL: 2.445″

    [​IMG]
     
  4. Dan308

    Dan308 New Member

    290
    0
    0
    regular .223/5.56 chamber with 55gr VMax OAL was 2.250" I really think it's either the base or the chamber.
     
  5. canebrake

    canebrake New Member

    21,833
    2
    0
    Bet it's the chamber.

    Have you tried to fire factory ammo in the recalcitrant RRA?
     
  6. Dan308

    Dan308 New Member

    290
    0
    0
    yes I have lots of mil surp Lake City and it fires no problem. I measured my reload against the mil surp and really get no conclusive numbers. I've got a new headspace gauge coming from Dillon that should let me know for sure. I'm also thinking get a bore mop, chuck it in a drill and Flitz the hell out of the chamber
     
  7. locutus

    locutus Well-Known Member Supporter

    16,393
    244
    63
    If you have a chrome lined chamber, don't polish it out.
     
  8. Dan308

    Dan308 New Member

    290
    0
    0
    checked my reloads with a Dillon headspace gauge. I get a headspace of .005 and the case OAL is .008 longer. Both of these are not enough to cause a problem in my other guns just this one RockRiver AR. Any thoughts?