1. Bikerdoc's passing and how you can help

    As many of you know, bikerdoc- AKA Al Spiniello- is no longer with us. There are always extra expenses when someone passes. If you would like to contribute to support his family, please do so here: Bikerdoc GoFundMe page.

    (Note - this notice can be dismissed by clicking on the X in the upper right corner.)
    Dismiss Notice

Is it ok to chamfer primer pockets?

Discussion in 'Handloading and Reloading' started by redactor, Mar 2, 2008.

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

    redactor Member

    Joined:
    Mar 7, 2007
    Messages:
    224
    Location:
    Huntsvegas, AL
    I use the primer attachment on my Redding T7 press to prime all of my cases. I've had it for a year, and this is the only thing that I don't like about that press. I use CCI primers, because they were cheap and I bought a couple thousand.

    I have often problems with primers not seating deep enough, and worse my primer seating is not consistent from case to case. This is with .45 Auto, .303 Brit, and 7.5 Swiss.

    Given that, I've noticed that if I use my chamfer/deburr tool to slightly chamfer the primer pocket, I get deeper and more consistent seating. Is it safe to do this? I've only tried it on a dozen or so assorted cases, and haven't fired any of them yet.
     
  2. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,076
    Location:
    Eastern KS
    If done lightly, it won't hurt a thing.

    Just don't overdo it!

    rcmodel
     
  3. amlevin

    amlevin Member

    Joined:
    Jan 15, 2007
    Messages:
    826
    Location:
    NW Washington
    I find that some brass is manufactured with a real square angle from case head to primer pocket. Almost square without any radius or chamfer at all. On these cases I just run them through my Dillon Superswage 600 and treat them like a Mil-Crimp case. This process adds a slight radius that allows easy seating of the primer, expecially in my progressive press.
     
  4. ClarkEMyers

    ClarkEMyers Member

    Joined:
    Oct 3, 2003
    Messages:
    930
    Location:
    A stone's throw from Henry's Fork
    People do it and report that it works.

    People do it and report that it works.

    It has been commonly done as a way to deal with the GI primer crimp with tools on hand. I'd sort of prefer to use a uniforming tool or a swedging tool rather than chamfer the primer pocket but I'd use whatever tools I had on hand myself.

    The only issue I know of is that it makes reading pressure signs from the primer even more of a guessing game - but reading pressure from the primer is a guessing game anyway.

    After changing the pocket with a chamfer the primer will tend to appear flatter as the primer expands a little bit to fill the the void created - assuming a void is created by chamfering around the corner of the primer pocket. This does not mean the loads are higher pressure. Also of course it makes the path for water or oil to seep in a little easier - but most people never expose their ammunition to water or oil - don't spray the cartridge or the loaded firearm with an oil.
     
  5. aka108

    aka108 Member

    Joined:
    Aug 26, 2006
    Messages:
    1,988
    Location:
    Tallahassee, FL
    Have some cases of 303 and 30-06 Greek surplus that I chamfer to remove the slight crimp in the primer pocked used on it when new. Never a problem.
     
  6. darwin-t

    darwin-t Member

    Joined:
    Oct 9, 2005
    Messages:
    161
    I did a bunch one night.. When I stood up somehow some of those shavings ended up in my eye. I have no idea how that happened, but it skeered me off from ever trying it again.
     
  7. 45ACPUSER

    45ACPUSER Member

    Joined:
    May 17, 2007
    Messages:
    807
    Location:
    Minnesota
    A slight twist of the chamfering tool works well to remove primer pocket crimps. Using a primer pocket uniformer would ID case that need the use of the chamfering tool..
     
  8. redactor

    redactor Member

    Joined:
    Mar 7, 2007
    Messages:
    224
    Location:
    Huntsvegas, AL
    Follow up: Bought an RCBS hand-priming tool last week.

    Analysis: I should have done this a long time ago. The hand-priming tool has solved all of my priming problems, and works with both RCBS and Redding shell holders.
     
  9. TexasSkyhawk

    TexasSkyhawk Internet SEAL

    Joined:
    Dec 17, 2007
    Messages:
    466
    Location:
    Texas
    I chamfer all of my long gun brass, and all of my target handload brass.

    Only need to do it once.

    Jeff
     
  10. brickeyee

    brickeyee Member

    Joined:
    Feb 25, 2005
    Messages:
    3,165
    You should consider modifying the primer seating punch before altering every case you load.
     
  11. Encoreman

    Encoreman Member

    Joined:
    Jul 24, 2006
    Messages:
    698
    Location:
    on the edge, Tn.
    I was once told and forgot what degree chamfer tool to use. Anyone got a good idea? Thanks Mac
     
  12. Walkalong

    Walkalong Moderator Staff Member

    Joined:
    Nov 20, 2006
    Messages:
    68,825
    Location:
    Alabama
    It is unnecessary most of the time. For some tight pockets just a couple of light twists will do.
     
  13. The Bushmaster

    The Bushmaster Member

    Joined:
    Jan 29, 2005
    Messages:
    8,094
    Location:
    Ava, Missouri
    I use my chamfer/deburing tool for those cases that need a more beveled lead for the primer pocket. Works for me
     
  14. adkpete

    adkpete Member

    Joined:
    Oct 5, 2006
    Messages:
    37
    Location:
    Way upstate New York
    I just had to chamfer a whole batch of privi brass in 7.5x55 I got from Grafs. I used my lyman 50 cal. chamfer tool so it wouldn't bottom out in the primer pocket
     
  15. 243winxb

    243winxb Member

    Joined:
    Jul 7, 2004
    Messages:
    12,420
    Location:
    USA
    Its not OK to chamfer primer pockets, IF OVER DONE, the primer will flow under a maximum load, sometimes blowing out the primer cup causing gas cutting of the bolt face. Winchester primers have a taper on there leading edge that helps guide/center the primer when just starting to seat. CCI primers are sometimes oversize in diameter in small mag pistol primers.
     
Thread Status:
Not open for further replies.
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice