Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

ROA misfires

Discussion in 'Blackpowder' started by ottsm, Oct 5, 2012.

Thread Status:
Not open for further replies.
  1. ottsm

    ottsm Member

    Joined:
    Sep 9, 2012
    Messages:
    77
    I have 3 ROA's. One SS, One Blued, both with target sights. Awhile back I ran into a SS high polished fixed sight version to make up my 3rd one. I took both SS versions out today at the range. I had never shot the fixed sight version yet. I've always used #10 Remington caps and they have always worked reliably.

    Shot the target sight version first for awhile, everything great as usual.

    Next I loaded the Fixed sight version, lined up the sights, pulled the trigger, misfire, backed up the cylinder and tried again, fired that time. Next time was also a misfire. Tried the other shots, some shot and some didn't. If I backed up and tried again they would eventually fire. Next round I made sure to get the caps down as far as I could. This seem to help some but still had misfires.

    Not sure what the problem is, perhaps the clearance between the nipple and the hammer must be too great. I measured the nipples with a caliper and compared them to my target sight ROA, seemed to be the same overall length. The diameter might be a tad larger, the #10's seem to fit a little snug in comparison. Could this be the issue, perhaps it needs #11's?

    Doesn't look like the unit was dry fired a lot, hammer seemed to be in good shape. One thing I do notice is that my target sight ROA has SS nipples and the Fixed Sight polished version has steel nipples (both had the Ruger hex head style nipples so they don't appear to be after market).

    Anyone have a similar issue?
     
  2. Jaymo

    Jaymo Member

    Joined:
    Aug 21, 2010
    Messages:
    3,530
    Maybe the previous owner replaced the factory hammer spring with a lighter weight, aftermarket spring.
    I'd try swapping hammer springs with one of your other ROAs, and see if the problem follows the spring. It's a quick way to confirm or eliminate light strikes as the culprit.
    My 1976 ROA likes CCI 11s, which is good, because I can't find Remington 10s locally, anymore..
    I save my Remington 10s for my Italian BP revolvers.
     
  3. arcticap

    arcticap Member

    Joined:
    Mar 20, 2005
    Messages:
    6,185
    Location:
    Central Connecticut
    The ROA was designed to have tight enough tolerances to allow dry firing without damaging the nipples. So it's conceivable that occasionally the tolerances will be too loose for it to function properly and as intended.
    There's options for dealing with it. If the mainspring, better nipples or different caps don't help then perhaps if there's a part of the hammer that's engaging the frame too early, a small adjustment can be made to allow closer contact of the hammer & nipple. Or similarly, a small part of the frame could be interfering with the hammer fall which could be adjusted to a small degree.
    If there's a choice, it's better to try to adjust or replace the part that are easier to replace.
    CCI caps are said to have the thickest amount of primer material inside of their cups, and they may have thicker metal too. Or try their magum caps which are also sold as #11 Winchester Magnums at many Walmart stores. So maybe that little extra amount could fill in the .00xx gap that's leading to poor ignition. Or try another set of nipples like the Slix-shot or Treso.

    http://longhunt.com/storelh/index.php?route=product/product&product_id=267
     
    Last edited: Oct 5, 2012
  4. J-Bar

    J-Bar Member

    Joined:
    Nov 24, 2010
    Messages:
    2,497
    Location:
    Springfield, MO
    I own a pair of ROA stainless fixed sight 7.5s that came with Ruger factory nipples and neither gun has ever misfired.

    Then I bought a pair of 5.5s that had Ruger factory nipples and they misfired frequently. I changed to Treso nipples on this pair and have not had a misfire since.

    So, some Ruger factory nipples are better than others.

    Before you start messing around with springs and grinding critical tolerances, swap out the nipples. Please.
     
  5. ottsm

    ottsm Member

    Joined:
    Sep 9, 2012
    Messages:
    77
    Thanks guys. I'll swap the nipples with my other ROA for sure and see what that does. Believe I bought some spare nipples with my first ROA, now if I could just remember where I put them.

    Guess Ruger must have changed from SS to steel at some point?
     
  6. Pancho

    Pancho Member

    Joined:
    Oct 23, 2007
    Messages:
    1,874
    Location:
    Southwestern, Ohio out in the country about 40 mil
    You could try seating the caps with a wooden dowel to make sure they are in close contact with the nipple face. Thumb seating is the ideal situation but not always the case.
    If the gun fires reliably after seating with the dowel I would suspect the nipples not being the correct size for your caps. Switching your nipples with the reliable gun would prove the same thing but is a little more complex.
     
  7. arcticap

    arcticap Member

    Joined:
    Mar 20, 2005
    Messages:
    6,185
    Location:
    Central Connecticut
    Try shimming the nipples

    Another idea would be to shim the nipples in order to raise them. It's easy to make your own shims or they can be bought from an outfit like Mcmaster Carr.
    Hellgate posted about how to make nipple shims:

    Shims:

    http://www.mcmaster.com/#shims/=jlfy1v
     
    Last edited: Oct 5, 2012
  8. BADUNAME30

    BADUNAME30 Member

    Joined:
    Mar 24, 2009
    Messages:
    1,876
    Location:
    Neshannock, Pa.
    The correct size 'shims' can be purchased at a hobbie shop that sells RC airplanes and cars.


    Hey Steve, what are the cross holes for in the Slix-Shots ?
     
  9. Patocazador

    Patocazador Member

    Joined:
    Jul 8, 2012
    Messages:
    2,773
    Location:
    Central Florida
    This is probably the problem since it fires the second time around. The 1st shot seats the cap, the second ignites it. Use a bigger cap like Pancho suggested.
     
  10. AJumbo

    AJumbo Member

    Joined:
    Feb 6, 2009
    Messages:
    772
    Location:
    Phoenix, AZ
    I ran into this problem with CC Magnum #11s, versus standard #10s. The Magnums were just a little longer and that created enough extra grip on the nipple keep the cap from seating fully. I went back to regular #10s and there was no more issue.

    It would be great if all the manufacturers #11s were the same size, but that just isn't the case. Since there are bound to be tolerance variations between runs of nipples as well, you just have to find a cap that works and stick with it. My ROA like CCI 10s and RWS 11s.
     
  11. arcticap

    arcticap Member

    Joined:
    Mar 20, 2005
    Messages:
    6,185
    Location:
    Central Connecticut
    My guess is that the hole is to redirect the back flash out toward the cap's sidewall so that the cap remnant won't be as likely to get blasted backward off the nipple. :rolleyes:
     
Thread Status:
Not open for further replies.

Share This Page