Seating into the lands...do you see any difference

Permanently deleted user

November 09, 2009 19:03

in seating .005 into the lands versus .01??? I'm getting VERY crappy groups right this moment and they've gotten worse since seating into the lands...just wondering if going further might help. Right now I'm at .005 into the lands with 73.5 grains of RL-22...thinking about bumping it up to 74 grains and .01 into the lands...any thoughts.?.?

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  jonk

  November 10, 2009 03:44

  Depends. Some guns it helps, some not. Never heard of it hurting accuracy but could be. In theory it should improve accuracy but there are barrel harmonics that are rather unpredictable to consider.
  
  The idea is that without a jump, the bullet should enter the rifling truer and shoot better.
  
  One issue you may find is that this increases pressure if you are really right against the lands. I'd try dropping the powder charge and seeing what that does. Just a guess.

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  mrbruce

  November 10, 2009 05:17

  There is always a place the bullet likes to be, and it's not aways into the lands...
  One of my 6br's shoots the best .016 off the rifling, and another likes them .022 into the lands, all with 105 Berger VLD's.......
  My 7mm SAUM's like em in different places also.....
  Just keep at it till you find the sweet spot....

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  bpost

  November 10, 2009 06:12

  Pull them back to .020 off and try a .020 jamb, refine from there in .005 increments. MOST cartridges and MOST rifles shoot best when full of powder and near max pressure. You really need to try changing nothing but the powder, using 4350 and/or 4831 to see if it works better for you.
  
  BTW 7828 gave me some nice groups in a 300 Win mag barrel some old coot sold to me with my Encore frame ;-)

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  mrbruce

  November 11, 2009 05:17

  Eye resemble that remark TOB [:D]

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  FrancF

  November 11, 2009 16:47

  My 40x's don't like that. .005-.010 off the lands work.

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  FEENIX

  November 12, 2009 02:30

  Eric,
  
  I got this from Berger bulletin ...
  
  http://02b0516.netsolhost.com/blog1/?p=43
  
  Good luck!
  
  Ed

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  JustC

  November 14, 2009 10:48

  Jamm them and try a group. Jamm seat at .020" and see what happens.
  
  VLD's most often have a secant ogive rather than a tangent ogive, which makes some seating characteristics different

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  sandwarrior

  November 14, 2009 13:41

  quote:Originally posted by ECC
  in seating .005 into the lands versus .01??? I'm getting VERY crappy groups right this moment and they've gotten worse since seating into the lands...just wondering if going further might help. Right now I'm at .005 into the lands with 73.5 grains of RL-22...thinking about bumping it up to 74 grains and .01 into the lands...any thoughts.?.?
  
  
  
  What are you loading for? What bullet weight? etc?

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