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Saami chamber

Discussion in 'Gunsmithing and Repairs' started by Iron Worker, Jun 14, 2018 at 1:02 PM.

  1. Iron Worker

    Iron Worker Member

    Joined:
    Nov 6, 2005
    Messages:
    16
    Location:
    Nevada
    Just received new 12"twist bbl. Gunsmith who is cutting the chamber said (22/250)"Standard SAAMI reamer will work,with room to seat bullets out farther if I want to touch the lands" . Others say they detest SAAMI reamers in custom bbls ,another says with zero free bore I can get an additional 1,000 rnds of bbl life . What say ye ?
     
  2. Blue68f100

    Blue68f100 Member

    Joined:
    May 25, 2011
    Messages:
    4,078
    Location:
    Piney Woods of East Texas
    I prefer min spec reamers which do not cut the leads/free bore. This allows me to use a throating reamer to set it for my use.

    Set it for what your going to shoot the most.

    Example: I just got through cutting a 223R chamber for my AR. I used a min spec reamer, which only gives 0.025" of lead/free bore, the std avg is 0.055". This is ideal if I shoot 65-69gr bullets, giving me a ~0.020" jump. But if I want to shoot 52gr bullets I will have to shorten the my OAL. The std OAL puts me 0.035" into the bore. I have one barrel (cut with the same reamer) in which I lengthen the free bore to shoot the light bullets. This one will be for the heavier bullets, has a slightly faster twist.
     
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