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Factory Crimp, tell me how this looks!

Discussion in 'Handloading and Reloading' started by Philippe, Jul 12, 2011.

  1. Philippe

    Philippe Well-Known Member

    Something just looks off to me. These are .357 mag, mixed brass and montana gold 125gr jhp's. Im using a Lee factory crimp die. Any suggestions?[​IMG]
  2. ranger335v

    ranger335v Well-Known Member

    So, what looks "off"?
  3. Philippe

    Philippe Well-Known Member

    I guess its the uneven parts of the brass when i crimp them, im still not to use to using this factory crimp die, i use to use the regular rcbs die and decided to give the factory crimp die a try. I know they function because i shot some like this over the weekend lol.
  4. Drail

    Drail Well-Known Member

    Looks good. Personally I think the "factory crimp" die is a sales gimmick and doesn't do anything that you can't accomplish with "standard" dies. I can see a lot of variation in case lengths in your photo. It is almost impossible to get consistent crimps when the cases are all different lengths. I flare very gently and use taper crimps for everything. The brass lasts much longer.
    Last edited: Jul 12, 2011
  5. Philippe

    Philippe Well-Known Member

    Yeah i noticed it too, its all mixed brass from a local indoor range.
  6. REL1203

    REL1203 Well-Known Member

    Oddly enough, i just ordered some of these same bullets, what load are you using for yours?
  7. Philippe

    Philippe Well-Known Member

    Those ones you are looking at in the pic are 125gr montana golds sitting over 10.0 grains of Power Pistol, small pistol primers, mixed range brass, seated to 1.580
  8. GLOOB

    GLOOB Well-Known Member

    The crimp looks way off to me. That's what my first couple rounds looked like when I overcrimped with a TAPER crimp die. My Lee .357 seater die puts a nice smooth roll on the mouth. I assume the FCD does, too, but I have hardly used it.

    Just a guess, but maybe the crimp groove on those bullets is too shallow for the amount of crimp you're trying to get.
    Last edited: Jul 13, 2011
  9. Walkalong

    Walkalong Moderator

    I agree GLOOB, the cannelure is extremely shallow, which does not allow a nice roll crimp. Not really a cannelure, just some roll marks on the bullet. I would taper crimp those bullets, although the OP's crimps are pretty good for what he had to work with.
  10. Master Blaster

    Master Blaster Well-Known Member

    The flat ring at the top of the roll crimp, means you are over crimping, and pushing the case beyond the crimp ring in the die. Back the die off 1/8 turn at a time until you get a rounded roll crimp without the flat ring at the case mouth.
  11. Philippe

    Philippe Well-Known Member

    I'm not trying to put a roll crimp on them....
  12. StandingTall

    StandingTall Well-Known Member

    The Lee FCD is putting the roll crimp on them because the .357 mag is a revolver load.

    The Lee FCD for revolver rounds applies a roll crimp, and the FCD for auto-loader rounds applies a taper crimp.

    You will have to adjust the level of the crimp (light/medium/heavy).
  13. Philippe

    Philippe Well-Known Member

    Ok so obviously I need to back off quite a bit with this factory crimp die.
  14. GaryL

    GaryL Well-Known Member

    The "roll" part of the crimp looks almost right, if it were to continue a few thousandths more. The crimp ring above that doesn't look right at all.

    Like the other guys said, 357 mag gets a roll crimp, not a taper crimp.
  15. Philippe

    Philippe Well-Known Member

    Ok, when I back off on this die it seems as if I am not getting a good crimp, I am about to go back to the rcbs dies.....
  16. Walkalong

    Walkalong Moderator

    If you do not want to roll crimp, buy a Lee or a Redding taper crimp only die. 99% of .38 Spl dies come with a roll crimp built in, as does the Lee FCD for .38 Spl.
  17. mdi

    mdi Well-Known Member

    Am I seeing a ridge above the curved part of the crimp? Looks like the rounds are crimped too much and is leaving a ridge, rather than a smoothe curve.
  18. jcwit

    jcwit Well-Known Member

    Do away with the FCD and do as walkalong says, your problems will be over.
  19. Fishslayer

    Fishslayer Well-Known Member

    Looks like the LFCD is turned too far in.

    The book calls for snugging to the case, then 1/2 turn (light) to 1 full turn (heavy) more.

    If you're crimping slow powder Big Dog loads then you want a roll crimp. It helps powder combustion & prevent the bullets from jumping crimp under heavy recoil.

    The LFCD is just to snug down the mouth & remove the bell. Those are for lower power target loads with faster powder.
  20. TennJed

    TennJed Well-Known Member

    I have gotten similar looking crimps using the lee factory crimp die.... I fillowed the instructions and did a full turn for a heavy crimp.... These are for loads that call for heavy crimps.... Now I am worried. Is there any danger in setting the crimp like above or will it just lower the case life?

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