bullet to lands, max distance?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by tstarky, Sep 24, 2012.

  1. tstarky

    tstarky Member

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    Hi,
    I have an older Remington 700 BDL, 30-06. Bought it used. It, shoots 2" or less groups at 100yrds. I want better accuracy for long range hunting, 600-800 yards.

    I'm in the process of measuring the chamber for reloading. I diassembled a Remington core Loct 180gr factory round and slid the bullet just into the case end, chambered the round and gentle ejected. I was surprised to discover a 0.170" distance between the rifling lands and the seating grove on the bullet.

    I repeated the measurement test with Hornaday measuring equipment, Berger and Sierra bullets. The bullets barly slid into the case, about .050". Not enough to create a safe reload.

    Has anyone seen such a gap between bullet and rifling lands? What should I do?
     
  2. FEENIX

    FEENIX Well-Known Member

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    Welcome to LRH and enjoy!

    Check out the similar/related threads below.
     

  3. Sully2

    Sully2 Well-Known Member

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    My Rem 22-250. My reloads are seated more than .125 further out that factory and can go even more...but wont feed from the magazine if I go more
     
  4. tstarky

    tstarky Member

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    Thanks Feenix. The largest gap reported there was .040 none addressed a 4 times+ larger gap of .170. Has anyone measured their Remington 700? What distance have you found? I'm wondering if this is factory or worn or miscut by a gunsmith.
     
  5. Joe King

    Joe King Well-Known Member

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    I'm jumping mine 0.080" any less than 0.060 jump and I can't use my magazine
     
  6. AZShooter

    AZShooter Well-Known Member

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    The best you can do is to seat the bullet deep enough in the neck so it don't move during recoil in the mag box. Work up a load and ignore the jump. Heck Weatherby used to have a .375" jump and they shot just fine.

    If it really bothers you, have the barrel setback and rechambered. Even better, get a new barrel and have it chambered to suit you.

    I just got through loading a friend's sporter 300 WSM. Due to short magazine OAL is 2.850. Jump to rifling is .140", it shoots just fine.
     
  7. tstarky

    tstarky Member

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    Thanks everyone.
    Having heard that there are rifles out there that shoot fine with a large jump to lands helps build my confidence in this rifles possibility to hold smaller groups by creating custom rounds.

    I spoke to Bruno's here in Phoenix AZ and he suggested that if I wanted a new custom barrel it would cost $900 because he would not place a new barrel without truing the action first. Sage advice. I was not ready to spend $900 on this 30-06 rifle today. I will do this on another more match favorable caliber rifle.
     
  8. AZShooter

    AZShooter Well-Known Member

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    Sounds like he doesn't want to do the job. I am certain if you shop around you could get a barrel installed for far less. IMO you don't have to blueprint the action to have reasonable accuracy. Heck I have several sporters that have Rem take off barrels installed with no other work done and they shoot 1/2 MOA or better.

    In the meantime be sure your barrel is clean, bedding is sound, action screws tight, crown in good shape then go ahead and make a load for your rifle.
     
  9. tstarky

    tstarky Member

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    thanks AZShooter. What barrels do you like and who installed them?
     
  10. AZShooter

    AZShooter Well-Known Member

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    I have four liljas and a bartlein. All the rest are factory. All the rest are rechambered rem factory takeoffs.

    I have used Harry Lawson Co in Tucson Az for over 20 yrs. Now I do my own barrel installations including chambering.