Enlarge 224 to 308 for piloted countebore?
Close
Login to Your Account
Results 1 to 10 of 10
  1. #1
    Join Date
    Aug 2012
    Location
    Canada
    Posts
    129
    Post Thanks / Like
    Likes (Given)
    74
    Likes (Received)
    16

    Default Enlarge 224 to 308 for piloted countebore?

    Is it at all practical to consider enlarging the initial section of a 224 bore (say 219 actual) to 308 (.300) so that I can use a piloted counter bore that I already own (made for .300)? If so, what would be the best way to do it accurately?

    After its all done, that section of bore get oblitered when I predrill it and use a boring bar to straighten it. So it does no harm as far as I can see to bore it out to .300 to allow the piloted counterbore to be used. But how to do it reasonably accurately?

    (EDIT: This is all work at the muzzle using a PTG bolt nose counterbore

    .705 Counterbore Without Step - Pacific Tool and Gauge

    made for roughly .300 and up pilots)

  2. #2
    Join Date
    Oct 2002
    Location
    Poetry Texas USA
    Posts
    1,726
    Post Thanks / Like
    Likes (Given)
    270
    Likes (Received)
    192

    Default

    Quote Originally Posted by Grizzlypeg View Post
    Is it at all practical to consider enlarging the initial section of a 224 bore (say 219 actual) to 308 (.300) so that I can use a piloted counter bore that I already own (made for .300)? If so, what would be the best way to do it accurately?

    After its all done, that section of bore get oblitered when I predrill it and use a boring bar to straighten it. So it does no harm as far as I can see to bore it out to .300 to allow the piloted counterbore to be used.
    So you have no way to single point to cut it? I see no problem if you cut that part of the muzzle off or bore and make a recessed crown.

  3. #3
    Join Date
    Aug 2012
    Location
    Canada
    Posts
    129
    Post Thanks / Like
    Likes (Given)
    74
    Likes (Received)
    16

    Default

    I could single point cut the bolt nose recess that this counterbore makes, but it worked so slick on my 308 that I would like to use it on my 223, but of course the pilot is too large. This particular brand, PTG doesn't permit a pilot for .223 to be used on it. I think it only goes down to .300. So if I could see a way to make the .219 bore opened up to .300, even if it lost .001 concentricity in the process, I could use the counterbore tool. My apologies if I am misnaming this tool. Its a piloted tool that makes the .705 for a Remington bolt nose at the breach.

  4. #4
    Join Date
    Sep 2018
    Location
    Posts
    31
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    15

    Default

    I just cut my counterbores with a boring bar, usually after the chamber is nearly complete. If you chamber first, there's not much left to cut.

    Sent from my Pixel 2 using Tapatalk

  5. Likes Butch Lambert, Grizzlypeg liked this post
  6. #5
    Join Date
    Oct 2002
    Location
    Poetry Texas USA
    Posts
    1,726
    Post Thanks / Like
    Likes (Given)
    270
    Likes (Received)
    192

    Default

    I do as Pat does his.

  7. #6
    Join Date
    Jun 2008
    Location
    TN
    Posts
    1,531
    Post Thanks / Like
    Likes (Given)
    312
    Likes (Received)
    247

    Default

    Same here.

  8. Likes Butch Lambert liked this post
  9. #7
    Join Date
    Oct 2002
    Location
    Poetry Texas USA
    Posts
    1,726
    Post Thanks / Like
    Likes (Given)
    270
    Likes (Received)
    192

    Default

    Quote Originally Posted by henrya View Post
    Same here.


    How is life treating you? Long time no see.

  10. #8
    Join Date
    Aug 2012
    Location
    Canada
    Posts
    129
    Post Thanks / Like
    Likes (Given)
    74
    Likes (Received)
    16

    Default

    Thanks for the good practical advice. I will take it.

  11. #9
    Join Date
    Jun 2008
    Location
    TN
    Posts
    1,531
    Post Thanks / Like
    Likes (Given)
    312
    Likes (Received)
    247

    Default

    Quote Originally Posted by Butch Lambert View Post
    How is life treating you? Long time no see.
    All is well. We have a new range up here that just got opened in February. I may start shooting UBR with them. How about you?

  12. #10
    Join Date
    Sep 2015
    Country
    UNITED STATES
    State/Province
    Florida
    Posts
    525
    Post Thanks / Like
    Likes (Given)
    4
    Likes (Received)
    66

    Default

    Dave Manson makes the counterbore tool with a #1 spindle for .22 cal.

    What else should we spend our money on, but more tooling?

    Besides, boring to within a thou just ain't in my skill set. The form cutter faces the barrel end and puts a radius on the counterbore entrance.

    Time is $$, the tool makes it fast, and perfect.


Tags for this Thread

Bookmarks

Posting Permissions

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