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crimping rifle bullets

Discussion in 'Handloading and Reloading' started by remmag, Aug 16, 2010.

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  1. remmag

    remmag Member

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    hey all
    i am getting set up to load for my 7 mm rem mag browning bar auto
    i have read in my manuals to crimp the bullets for an auto loader, i was hoping to use game king bullets,i have killed alot of deer with them and i know they perform well
    question is as i look on sierra web site the show the bullets without a cannalure for crimping, how do i ensure that i get a bullet that has the cannalure , also does any one have load data for these, i will hopefullt\y use 160 grin bullets

    thanks
     
  2. Grumulkin

    Grumulkin Member

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    I've loaded for 308, 7.62X39, 30/06, 458 SOCOM and 223 autoloaders and didn't crimp for any of them. I doubt you'll need to for a 7mm Mag. If you decide to crimp, get a Lee Factory Crimp die as it will crimp even if the bullet doesn't have a cannelure.
     
  3. steve4102

    steve4102 Member

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    Yup, get a Lee Factory Crimp die. They work great, increased accuracy, secures the bullet and inexpensive.
     
  4. dhfenno

    dhfenno Member

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    I'm loading Sierra Pro Hunter (with no cannelure) rounds for my .308 autoloader and use the Lee factory crimp die.
    I got away from rounds with a cannelure because so many of the 180gr bullets have a cannelure that is such that if I crimp on the cannelure my OAL goes far below the 2.80 OAL my gun likes.
    The factory crimp die works with or without a cannelure on the bullet.
     
  5. jleyring

    jleyring Member

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    Ive never crimped rifle brass and never had any problems. Pistol I always crimp.
     
  6. remmag

    remmag Member

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    i have a factory crimp die on order

    thanks
     
  7. qajaq59

    qajaq59 Member

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    I wish they would use a better term then crimp. That makes it sound like we should squeeze the mouth of the case deep into the bullet. I rarely crimp except for my tubular mags. But even when I do it's just a light kiss. Don't squeze them to death or it will move the rest of the neck, below the crimp, away from the bullet. And that wont help your accuracy a bit.
     
  8. jwr_747

    jwr_747 Member

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    crimp usually not needed BUT,did some serious load testing for a Swiss K-31 and bullets crimped with the Lee FC die won the race over non-crimped..jwr
     
  9. hey_poolboy

    hey_poolboy Member

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    I'd load some up and see how they cycle through w/ and w/o crimps. If the un-crimped ones cycle through just fine I would stick with them. I have always experienced better accuracy w/o a crimp, but YMMV.
     
  10. jhansman

    jhansman Member

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    FWIW, I only crimp for my AK, never for my bolt gun. I use Lee's FCD and it works wonderfully.
     
  11. HOWARD J

    HOWARD J Member

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    Everytime I have used a Lee FCD on my 7.62 x 39 it leaves a
    circular indent near the mouth of the case---is it supposed to do that???
     
  12. rcmodel

    rcmodel Member in memoriam

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    Yes.
    Thats the way they work.

    It is a collet crimp done by the collet fingers squeezing a ring in the case mouth.

    rc
     
  13. TonyAngel

    TonyAngel Member

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    I crimp for my AR. I don't do it to prevent bullet movement. I never had a problem with that. I do it because it tightened up my groups. I load 77gr Sierra match kings without the cannelure and they work just fine using the Lee FCD.
     
  14. HOWARD J

    HOWARD J Member

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    Wow !!!!
    If I move the die a little each time--all I have to do to find out how many times
    I reloaded the case ---is to count the rings---Boy that wunderbar......................
    I think I will stick with my taper crimp die......................
     
  15. TonyAngel

    TonyAngel Member

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    The ring disappears after firing, just like any other dents in the brass.
     
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