Page 1 of 2 12 LastLast
Results 1 to 15 of 22

Thread: Neck interference fit

  1. #1
    Join Date
    Mar 2008
    Location
    Sun City, AZ
    Posts
    26

    Shoulder Bump

    With a .224 bullet and brass with .014 neck wall thickness has anyone found .001 or .002 shoulder bump to be more conducive to accuracy using a single round fed bolt action?
    Thanks
    Last edited by firearmsunlimit; 09-20-2021 at 05:30 PM. Reason: Misstated question

  2. #2
    Join Date
    Oct 2019
    Posts
    669
    way too little info to base a reply on.

    yes i have used .001 on a bolt gun
    but it was my gun my ammo and my loading process

  3. #3
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
    Posts
    7,012
    Quote Originally Posted by firearmsunlimit View Post
    With a .224 bullet and brass with .014 neck wall thickness has anyone found .001 or .002 to be more conducive to accuracy using a single round fed bolt action?
    Thanks
    What would you gain with that tight of clearance? To put it in perspective, the thickness of a brown hair (human) is about .003".

  4. #4
    Join Date
    Feb 2003
    Location
    Houston, Texas
    Posts
    8,075
    A lot of the misconceptions concerning loaded round to neck clearance has itís origins in the Houston Warehouse Experiments.

    As a competitive Benchrest Shooter, I would say ignore all of that. You might be able to get an extreme accuracy combination to shoot some tiny groups in a totally controlled environment that simply does not translate in the real world. We do not shoot Matches in a controlled environment.

    The trend in Benchrest in the past years has been to run a little more clearance. Around .0025 loaded round clearance for 6mm and 22, .003 for the short 30ís.

    The rifle will agg just as well, and you can avoid any pressure spikes due to insufficient bullet release.

  5. #5
    Join Date
    Mar 2008
    Location
    Sun City, AZ
    Posts
    26

    Correction

    Quote Originally Posted by firearmsunlimit View Post
    with a .224 bullet and brass with .014 neck wall thickness has anyone found .001 or .002 to be more conducive to accuracy using a single round fed bolt action?
    Thanks
    what i was trying to say relates to shoulder bump.

  6. #6
    Join Date
    Mar 2008
    Location
    Sun City, AZ
    Posts
    26
    Quote Originally Posted by rsmithsr View Post
    way too little info to base a reply on.

    yes i have used .001 on a bolt gun
    but it was my gun my ammo and my loading process
    So what would you like to know to make a judgement concerning shoulder bump?

  7. #7
    Join Date
    Mar 2008
    Location
    Sun City, AZ
    Posts
    26
    Quote Originally Posted by jackie schmidt View Post
    A lot of the misconceptions concerning loaded round to neck clearance has itís origins in the Houston Warehouse Experiments.

    As a competitive Benchrest Shooter, I would say ignore all of that. You might be able to get an extreme accuracy combination to shoot some tiny groups in a totally controlled environment that simply does not translate in the real world. We do not shoot Matches in a controlled environment.

    The trend in Benchrest in the past years has been to run a little more clearance. Around .0025 loaded round clearance for 6mm and 22, .003 for the short 30ís.

    The rifle will agg just as well, and you can avoid any pressure spikes due to insufficient bullet release.

    Actually I should have been more clear. My question relates to shoulder bump.

  8. #8
    Join Date
    Feb 2003
    Location
    Houston, Texas
    Posts
    8,075
    Quote Originally Posted by firearmsunlimit View Post
    Actually I should have been more clear. My question relates to shoulder bump.
    .001 to .002 should be just right.

    As you fire the cases more, you might have adjust your die a tad down to maintain this as the brass tends to work harden in that abused area and refuses to give as much.

    For my competition rifles, (30BR, 6PPC), I actually lean more toward .003 to .004 for ease of loading and extraction.
    Last edited by jackie schmidt; 09-20-2021 at 08:12 PM.

  9. #9
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
    Posts
    7,012
    Back to your original post. Shoulder bump will not affect accuracy.

  10. #10
    Join Date
    Feb 2006
    Location
    Wilcox, PA
    Posts
    1,224

    Cool

    Quote Originally Posted by butch lambert View Post
    back to your original post. Shoulder bump will not affect accuracy.
    anything done to cases can affect accuray in some way.

  11. #11
    Join Date
    Feb 2006
    Location
    Wilcox, PA
    Posts
    1,224

    Cool

    Quote Originally Posted by billbrawand View Post
    anything done to cases can affect accuray in some way.
    shoulder bump changes seating deth.

  12. #12
    Join Date
    Feb 2006
    Location
    Wilcox, PA
    Posts
    1,224

    Cool

    Quote Originally Posted by billbrawand View Post
    shoulder bump changes seating deth.
    if not figured in.

  13. #13
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
    Posts
    7,012
    Quote Originally Posted by BillBrawand View Post
    shoulder bump changes seating deth.
    You must have a different seating die than I.

  14. #14
    Join Date
    Mar 2008
    Location
    Sun City, AZ
    Posts
    26
    Quote Originally Posted by firearmsunlimit View Post
    So what would you like to know to make a judgement concerning shoulder bump?
    Have you found a .001 or a .002 bump to make any difference in accuracy.

  15. #15
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
    Posts
    7,012
    Quote Originally Posted by firearmsunlimit View Post
    Have you found a .001 or a .002 bump to make any difference in accuracy.

    No

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •