land marks

Discussion in 'Reloading' started by reed, Jul 23, 2008.

  1. reed

    reed Well-Known Member

    Messages:
    88
    Joined:
    Dec 8, 2007
    I'm loading 210 bergers, and I wanted to try to find the lands, so I polished the bullet real well, seated a couple, loaded and closed the bolt. The bullet shows land marks on only half the bullet when I extract it, do I need to seat deeper or out further out,

    Travis
     
  2. HoytemanPA

    HoytemanPA Well-Known Member

    Messages:
    230
    Joined:
    Dec 16, 2001
    Twist bullet in 0000 steel wool. Increase length until you see number of squares equal to number of lands.

    Rectangles showing lengthways of bullet too deep. Rectangles across bullet or not all lands showing, too shallow.

    Seat further out.
     

  3. MagMan

    MagMan Well-Known Member

    Messages:
    1,008
    Joined:
    Dec 20, 2002
    Wouldn't that mean the bullet isn't concentric to the case?
     
  4. NesikaChad

    NesikaChad Well-Known Member

    Messages:
    753
    Joined:
    Jan 28, 2007
    Might also mean a horrible chamber job.

    Just what you wanted to hear huh?
     
  5. britz

    britz Well-Known Member

    Messages:
    1,217
    Joined:
    Mar 11, 2007
    Just in case, are you sure that the scratches on one half the bullet are not scratch marks from ejection?? I hope for your sake they are because the alternative isn't very good.
     
  6. reed

    reed Well-Known Member

    Messages:
    88
    Joined:
    Dec 8, 2007
    It's not ejector marks, at first I blackened bullet with a candle and loaded, and kept seating deeperuntil I didn't see marks, when I did this I had marks whole way around. After I decided where to start loads I loaded some up and shot at 300yds to find load and could only manage 3-4" groups, so I figured I would recheck and thats when I noticed that only half bullrt had land marks.

    Travis
     
  7. Tyler Kemp

    Tyler Kemp SPONSOR

    Messages:
    1,461
    Joined:
    Aug 10, 2006
    That's still 1 MOA. What kind of rifle is this in?
     
  8. britz

    britz Well-Known Member

    Messages:
    1,217
    Joined:
    Mar 11, 2007
    Are you full length resizing. If you are, it is theoretically possible that your case is being shoved towards the ejection side of your chamber by the springloaded ejection plug causing the bullet to touch the right lands first??? Not sure if this makes sense, just brainstorming here ;). As Tyler said, you are still getting groups that arnt too bad here. I'm no gunsmith, but as I think about it, I don't think it is possible for the rifleing to be cut at different lengths. They are cut by a rotary tool and there would have to be some absolutely horrible things going on to get ther rifling cut to different lenghts. If you are fl sizing and you do have a spring loaded ejector, I would consider doing PFL resizing or neck sizing. Just another thought.
     
  9. reed

    reed Well-Known Member

    Messages:
    88
    Joined:
    Dec 8, 2007
    gun is a 300wthby 40* shoulder, trued action, sako extractor, 27" hart barrel, rem 700, I am full length sizing my cases.

    Travis