Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Am I using too much crimp?

Discussion in 'Handloading and Reloading' started by blazerking78, Sep 17, 2009.

Thread Status:
Not open for further replies.
  1. blazerking78

    blazerking78 Member

    Joined:
    May 11, 2009
    Messages:
    32
    Location:
    In The Hills, Montana
    The title says it all. If I am how much is needed on an auto pistol. I've read the crimping thread, but I just wanted to have my work double checked by those of you with a lot more experience then I have. The bullet on the left was pulled after I got the dies set up and the other is new.
     

    Attached Files:

    • 014.jpg
      014.jpg
      File size:
      673.8 KB
      Views:
      304
    • 012.JPG
      012.JPG
      File size:
      100.8 KB
      Views:
      285
  2. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    Yep! Too much.
    It appears from the bullet photo that the crimped one has had the jacket compressed making the bullet wasp-wasted.

    A proper taper crimp has the brass just kissing the bullet but not compressing into it.

    rc
     
  3. blazerking78

    blazerking78 Member

    Joined:
    May 11, 2009
    Messages:
    32
    Location:
    In The Hills, Montana
    Thanks RC. Will this much crimp lead to over pressure? Should the bullet not have any marks one it has been cripmed?
     
  4. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    46,709
    Location:
    Alabama
    Yep, way too much crimp.

    Example of .45 ACP Crimp. 40 should be the same. Like rcmodel said, just enough to remove the bell, maybe a hair more.

    Pic link
     
  5. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    Zactly!

    I said:
    Your excess crimp will not cause any pressure problems, unless the "loose" too tight crimp lets the bullet compress into the case during feeding.

    What? :what:
    Compressing the bullet with the crimp may actually lead to a looser bullet fit then you had from neck tension alone.

    The soft lead core of the bullet has no "spring-back" like the harder brass case.
    SO, when the round comes out of the crimp die, the case springs back a little, but the soft bullet doesn't.
    Thats why no amount of taper crimp can make up for insuficient neck tension to start with.

    Your damaged bullets may not be as accurate though.

    rc
     
  6. The Bushmaster

    The Bushmaster Member

    Joined:
    Jan 29, 2005
    Messages:
    7,849
    Location:
    Ava, Missouri
    Over pressure? Probably not. .45 ACP is a relative low pressure round in the first place...I AM assuming that is a .45 ACP...
     
  7. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    46,709
    Location:
    Alabama
    Looks like a 4 tay to me. :D
     
  8. blazerking78

    blazerking78 Member

    Joined:
    May 11, 2009
    Messages:
    32
    Location:
    In The Hills, Montana
    Yes it is a 45. Fooortayyy is for wappers. I reset my die and came up with this. Let me know what you think.
     

    Attached Files:

    • 017.jpg
      017.jpg
      File size:
      575.8 KB
      Views:
      166
  9. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    It looks more better but it's hard to tell from photo's.

    Lay a steel rule, or the edge of your dial caliper against the case and see if there is any daylight showing where the bell used to be.

    All you want to accomplish with the taper crimp is to remove the bell and make the case wall perfectly straight again.

    rc
     
  10. The Bushmaster

    The Bushmaster Member

    Joined:
    Jan 29, 2005
    Messages:
    7,849
    Location:
    Ava, Missouri
    Looks good to me...Don't know about the other two "critics" on here, but......:evil:
     
  11. ants

    ants Member

    Joined:
    Nov 24, 2007
    Messages:
    3,551
    Just a tiny interjection:

    Depending upon the type of crimp die you use, case length affects the amount of crimp.

    Even though I don't trim auto pistol brass, I certainly trim 357 and 44 mag so I get the consistent revolver crimp I need.

    Anthony
     
  12. blazerking78

    blazerking78 Member

    Joined:
    May 11, 2009
    Messages:
    32
    Location:
    In The Hills, Montana
    I realy appriciate all the help from every one.
     
  13. Drail

    Drail Member

    Joined:
    Jan 17, 2008
    Messages:
    5,378
    Before you load a round hold an empty case up to a good light source and sight down the side of the case. Can you see the flare of the mouth? Now load and crimp a round until you can't see any flare looking down the side of the case. Then crimp just a little more. I mean just a little bit more. That's all you really want to do a semi auto round, just remove the flare because the round has to stop in the chamber on the mouth.
     
  14. xmanpike

    xmanpike Member

    Joined:
    Feb 25, 2009
    Messages:
    447
    Location:
    Houston, TX
    after viewing this i think i may have been over crimping my bullets. is there any danger to this or just a possible loss of accuracy?
     
  15. The Bushmaster

    The Bushmaster Member

    Joined:
    Jan 29, 2005
    Messages:
    7,849
    Location:
    Ava, Missouri
    If you do crimp them tooo much you stand a chance of the cartridge going too deep into the chamber and out of reach of the firing pin...
     
  16. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    46,709
    Location:
    Alabama
    The second crimp looks very good. I was fooled on the first pic. It looked longer for some reason. :uhoh:
     
  17. ants

    ants Member

    Joined:
    Nov 24, 2007
    Messages:
    3,551
    Well yes, Anthony, when a 45 caliber looks like 40 caliber, I believe that the crimp is a bit too tight! Don't you?

    :neener::p:neener:
     
  18. FROGO207

    FROGO207 Member

    Joined:
    Dec 7, 2008
    Messages:
    6,299
    Location:
    Mount Desert Island Maine
    Is that a one size fits all bullet? I gotta get me some of them. :D
     
  19. lindy

    lindy Member

    Joined:
    Nov 29, 2007
    Messages:
    42
    Location:
    Central California
    if you take a look at the base of the case in the second pic, it appears there is some damage to the rim------ Be Carefull..
     
  20. tlen

    tlen Member

    Joined:
    May 12, 2008
    Messages:
    526
    Location:
    Kansas
    Generally .45ACP should be crimped in the range .469-.471".
     
  21. blazerking78

    blazerking78 Member

    Joined:
    May 11, 2009
    Messages:
    32
    Location:
    In The Hills, Montana
    The damage to the case head has been discussed in a different thread. My newest 1911 didn't have all of the proper machining done to the breach face. A very small part on the edge is raised and causing the casing to dent. Its no biggie, I have ordered files to correct the problem. Its small enough that it would not be worth it to me to send it in to Taurus. :cool:

    I miked all my cases in the test batch and they are all at .470 to .471.

    I have to say that I love my RCBS bullet puller. I would waste alot of brass and bullets trying to get every thing correct.:)
     
  22. David E

    David E Member

    Joined:
    Aug 3, 2008
    Messages:
    7,455
    Run a few thru the loading cycle of the gun and see if the bullet is pushed back into the case.

    THAT can cause serious over pressure problems far worse than a little too much crimp.

    I don't care if I indent the pistol bullet with the crimp as long as the bullet does not set back into the case during the trip up the feedramp.

    Safety first.
     
  23. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    46,709
    Location:
    Alabama
    I knew someone would say that. :D


    It should not cause that dent, it should only stamp a small, very shallow (.005ish) indention in the case.
     
  24. Steve C

    Steve C Member

    Joined:
    Jan 5, 2006
    Messages:
    4,671
    The purpose of the crimp is to hold the bullet and prevent set back during feeding, any more than needed to perform these functions may be considered excessive.

    The proof however, is in the shooting not in how it looks or what they measure. If they shoot well who cares how much the crimp is?
     
  25. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    46,709
    Location:
    Alabama
    As long as it doesn't adversely affect function, and shoots well, it doesn't matter, much.
     
Thread Status:
Not open for further replies.

Share This Page