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

Strange results from a seemingly perfect barrel

Discussion in 'General Gun Discussions' started by flightsimmer, Apr 2, 2012.

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

    flightsimmer Member

    Joined:
    Nov 1, 2008
    Messages:
    279
    Location:
    S.E. Indy
    I was reading the other day about a fella that was having problems with a rifle he had bought and it was shooting all over the place and it reminded me that I had one like it, not the same model or brand but it shoots all over the place.
    Now I’m not new to firearms by any means and I thought I could figure out what the problem was but so far no luck.
    I have a stainless 16” barrel from a 10mm carbine that slugs a perfect .401 and is uniform from chamber to muzzle (by feel resistance) and looks to have a clean and true cut crown. The rifling is 1 turn in 16” and is 6 land and grove of about .004, much the same as my super accurate 5” Delta Elite, Bar-Sto 10mm barrel. There is no stock on this barrel and I consider it to be a free floating blow back operated barrel.
    I have not shot any jacketed bullets in it, just mild (by 10mm standards) 175gn. TC cast lead like I use in my Delta Elite and they work great in it. At first I thought it might be the sights but I have tried several different ones with the same results so I’m still left searching for answers. Got any ideas?

    10mm, when you care enough to send the very best.
     
  2. Certaindeaf

    Certaindeaf member

    Joined:
    Jan 16, 2012
    Messages:
    5,170
    Location:
    Wet Oregon
    What's the measured diameter of your cast slugs?
     
  3. 25cschaefer

    25cschaefer Member

    Joined:
    Jan 24, 2011
    Messages:
    942
    Location:
    Flathead Valley, MT
    Maybe the rail you are mounting the sights to?
     
  4. Certaindeaf

    Certaindeaf member

    Joined:
    Jan 16, 2012
    Messages:
    5,170
    Location:
    Wet Oregon
    A carbine will send them faster of course. If it's over about 1400fps and they are plain base, there's your (a) likely problem.
     
  5. flightsimmer

    flightsimmer Member

    Joined:
    Nov 1, 2008
    Messages:
    279
    Location:
    S.E. Indy
    Quote: What's the measured diameter of your cast slugs?

    Sized to.401

    Quote: Maybe the rail you are mounting the sights to?

    I cannot find any looseness in the sight or base. I first thought it might be a defective red dot sight but I've tried several.

    Quote: A carbine will send them faster of course. If it's over about 1400fps and they are plain base, there's your (a) likely problem.

    Yes, that may be a possibility, I've got a new Chrony but have not got to use it yet. I may try it in my garage since I can't get to a range yet.
    Jacketed bullets might do much better in that case but I'll need to get to somewhere where I can try it outdoors.

    Their building a new indoor range close to me but it will be a while yet on account of building permits.
     
  6. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    It should slug .400".

    They need to be sized .402" - .403" for a .401" bore.

    rc
     
  7. flightsimmer

    flightsimmer Member

    Joined:
    Nov 1, 2008
    Messages:
    279
    Location:
    S.E. Indy
    OK, today I chrongraphed my normal hand load at 1279 fps from the 16" barrel, hardly to fast for a lead bullet. I also chronographed the same load in my Delta Elite at 1055 fps.
    Still looking for a cause.
     
  8. Ludasmith

    Ludasmith Member

    Joined:
    Jan 24, 2012
    Messages:
    37
    Location:
    Pinehurst, NC
    You are still using the same cast bullet? I'd try a box of factory ammo, maybe a couple different brands/weights/whatever and see if it's possible it just doesn't like that load.
     
  9. ball3006

    ball3006 Member

    Joined:
    Dec 26, 2002
    Messages:
    2,874
    Location:
    Texas
    It is your ammo. Try different brands and bullet weights...chris3
     
  10. flightsimmer

    flightsimmer Member

    Joined:
    Nov 1, 2008
    Messages:
    279
    Location:
    S.E. Indy
    Quote: It is your ammo. Try different brands and bullet weights...chris3

    I don't disagree but it's seems strange that I get excellent results from my Delta Elite but not the carbine. I re-slugged the carbine and checked the specs and the only difference I can see or measure is that one has a right hand twist and the other has a left hand twist.

    [​IMG]
     
    Last edited: Apr 10, 2012
Thread Status:
Not open for further replies.

Share This Page