bushmaster wont cycle reloads

Discussion in 'Technical Questions & Information' started by hard head, Mar 18, 2012.

  1. hard head

    hard head New Member

    Mar 18, 2012
    i own a bushmaster .223 that shoots well and is very accurate, but it will not cycle my reloads. it does cycle factory shells. my reloads are loaded with new winchester brass, 55gr bthp bullets, 20.3 grains of imr 4198. the shell shoot and are accurate, but i have to use the charge bar to load every round. im thinking the shells are loaded to light. any suggestions??
  2. TRAP55

    TRAP55 Active Member

    I ran into the same problem once when I changed powders. I was getting 200fps more, but the rifle wouldn't cycle. Went back and checked the chamber pressures in the load data, and the new powder wasn't producing the pressure needed to cycle the action.
    Another culprit I've ran into on two different rifles, was the fit of the gas tube end into the bolt carrier key. That one will drive you nuts trying to find the problem if you're not looking for it. One was to short (Bubba installed gas tube) and the other had a worn out key. The hole in the key was a good millimeter larger than the gas tube OD.

  3. ostrick

    ostrick New Member

    Jan 28, 2012
    Did you full length size the new brass?
  4. Helix_FR

    Helix_FR Active Member

    Apr 14, 2009
    Imperial, MO
    pressure spike is outside of the barrel. You may need to convert to a faster burning powder.
  5. American Leader

    American Leader Well-Known Member

    Mar 1, 2011
  6. cycloneman

    cycloneman Well-Known Member

    Dec 16, 2008
    Do you have a chrony? If so what kind of velocity are you getting. This may give us some insite.

    I have never used imr 4198. Looks like max load is also 21gr so your close to it allready. I also suggest trying another powder. I have used all of the powders listed below with no problems in the 223. Good luck.

    Good powders for the 223 are

    IMR family 4064

    Accurate: 2230, 2460 Alltho i would opp for the 2460, alittle more versatel.

    Ramshot: Tac

    WInchester: 748
    Last edited: Mar 18, 2012
  7. muddober

    muddober Active Member

    Sep 19, 2008
    Carson City Nevada
    You are not telling us enough. When you fire the gun does it throw the empty out or are you having to manually cycle the empty as well. Then the next question have you tried shooting four or five factory loads to make sure it is not your reloads.

    So many times guys take their gun apart to clean it then shoot different ammo and the gun doesn't function and they automatically think it must be the ammo. 20.3 grains of 4198 should make your gun function just fine, so my guess is it is something else.

  8. TRAP55

    TRAP55 Active Member

    Just an after thought, the three bolt rings should have the end gaps staggered in thirds. If they are all lined up, that will cause the bolt carrier to half cycle too.

  9. jlloyd73

    jlloyd73 Active Member

    Nov 28, 2010
    I agree with muddober though, more info is needed. Did this fella use factory loads in between the reloads and they were fine. If so its the reloads......if not it could be the gas system of the gun.
  10. trex1310

    trex1310 New Member

    Apr 11, 2009
    Mobile, AL
    You might check the o.d. of your reloads versus a factory round.
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