Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 48

Thread: Squib round/Stuck 5.56 bullet

  1. #21
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,833
    Feedback Score
    14 (100%)
    Quote Originally Posted by JerihoAlann View Post
    thank you for the thread!
    I figure I get to brag on some successes.... I better own the bone head things I do too!
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  2. #22
    Join Date
    Aug 2017
    Location
    Lowcountry, SC.
    Posts
    6,174
    Feedback Score
    30 (100%)
    Quote Originally Posted by triggerjerk View Post
    I hear you, Disciple. Maybe time it before significant heat transfers from barrel to bullet? Or not... Of course in my simple mind, I would envision any metal expanding in all directions resulting in larger o.d. and smaller hole. Glad it's not like that, or heating my uppers to accept barrels wouldn't have worked. Wife wudda been pissed if I'd had to empty the freezer to make room for rifle barrels in order to shrink barrel extensions.... Again, hope we can all somehow avoid this in the future.
    When I was in middle school, we had a lab where the teacher heated up a metal ring, which then allowed a metal ball to pass. Blew my mind, as I expected the ID to shrink due to expansion. But, as you say, the metal expands in all directions, which causes the ring to grow, even in ID.

    When we add in coefficient of thermal expansion, we find that aluminum expands more rapidly than steel, leading to a looser fit at the barrel extension, even if you heat both the barrel and the receiver the same amount. And a titanium gas block is tighter when hot than a steel one, because Ti expands less than steel. Or, lead and copper expand more than steel, sticking harder when hot (perhaps; I haven't tried it).

  3. #23
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,833
    Feedback Score
    14 (100%)
    Quote Originally Posted by 1168 View Post
    Blew my mind, as I expected the ID to shrink due to expansion.
    That's what I'd expect too.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  4. #24
    Join Date
    Mar 2015
    Posts
    1,755
    Feedback Score
    0
    Quote Originally Posted by markm View Post
    That's what I'd expect too.
    Think of it this way:

    If you heat a bar it gets longer.

    If you curl a bar into a circle and heat it up, it still gets longer.

    So when a ring is heated the perimeter of both the ID and OD increase and since the perimeter is tied to the diameter, that must increase as well.

    Attachment 66988

    You also have to remember that when you shoot a round there is a significant internal pressure that will inflate the bore and increase the inside diameter. After the bullet gets stuck, the bore relaxes to its original diameter and pinches the bullet.
    Last edited by lysander; 12-16-21 at 08:55.

  5. #25
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,833
    Feedback Score
    14 (100%)
    Makes sense. Heating the barrel... assuming I could heat it quickly enough that too much head didn't also transfer to the bullet might have made tapping it out a little easier. (I hope to never have to try this EVER)
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  6. #26
    Join Date
    Dec 2017
    Posts
    320
    Feedback Score
    0
    FWIW, the other squib in my life: 20+ yr old ammo in 10/22 squib. Ended up whittling several sticks as I learned to cut them just long enough to protrude from muzzle. If they stuck out too far, I broke them when attempting to drive bullet out. Wonder if that would translate at all to other situations.... Anyway, had an inch to go and all bets were off. Sticks just broke. Went home and my Dewey rod handle survived.... Most interesting is that when I returned to the range, no extraction. Discovered extractor parts had blown out! Found them all in proximity, and the gun runs to this day....

  7. #27
    Join Date
    Dec 2006
    Posts
    2,860
    Feedback Score
    5 (100%)
    Quote Originally Posted by lysander View Post
    You also have to remember that when you shoot a round there is a significant internal pressure that will inflate the bore and increase the inside diameter. After the bullet gets stuck, the bore relaxes to its original diameter and pinches the bullet.
    I had not considered that. I suppose one should mimic this for removing a stuck bullet if that is possible. One idea I read was to fill some length the bore ahead of the obstruction with oil, place a rod with a seal above that, and hit the rod with a hammer. If this were done well I imagine substantial hydraulic pressure could be produced. What do you think of that idea?

  8. #28
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    32,833
    Feedback Score
    14 (100%)
    Quote Originally Posted by triggerjerk View Post
    as I learned to cut them just long enough to protrude from muzzle.
    I did this with the rod I used. Left just an inch or so of extra length. Anything more just bends and absorbs all the impact energy.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  9. #29
    Join Date
    Dec 2017
    Posts
    320
    Feedback Score
    0
    I was still trying to wonder if taping rings along rod would have reduced flex in the bore enough for it to work, but if you, too, had to shorten rod like I did (and after comments of others in this thread), prolly not. Glad bullet was close enough for you to drill. Here's hoping the rest of our bullets clear the muzzle in appropriate fashion!....

  10. #30
    Join Date
    May 2009
    Location
    UT
    Posts
    443
    Feedback Score
    0
    How close were you to just buying a new barrel?

Page 3 of 5 FirstFirst 12345 LastLast

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
  •