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Crimp Die - 9mm

ItGoBang
A friend said I should use a Crimp Die on my 9mm's, Why would I want to do this? Is it better??[:)]

It will hurt you, More than it will hurt me..

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Comments

6 comments

Date Votes
  • DONDALINGER
    I do not reload for 9mm, but I do load for .45ACP and I never crimp because the case is "rimless" and the round chambers on the end of the brass. I'm pretty sure the 9mm is the same. If you must crimp, keep it light. I bet someone on the reloading forum can give you a better description of why not to crimp the 9mm. I do roll crimp my .44 mag, .44 special and .357/.38 because they have a "rimmed" case.

    "They call me Don. Dr. Jason Donald Dalinger."
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  • joeaf1911a1
    A taper crimp die will smooth out any excess case expanding belling making more positive feeding.
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  • ATF
    quote:Originally posted by joeaf1911a1
    A taper crimp die will smooth out any excess case expanding belling making more positive feeding.


    Right on the nose!! [^] [^]

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    When a worm wants to relax,does he go fishing? "And remember a wet dog doesn't fly at night" "My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be." ATF,Eagle Guns
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  • heavyiron
    Joe is correct.

    There are two types of crimping dies in general use - the taper crimp die and the roll-mouth crimping die. What your friend is talking about for the 9mm is using a taper crimping die (I hope).

    Rolled mouth crimp dies are for revolvers and will roll the case mouth into one of the cannalures (crimping grooves) on the bullet. This is perfectly adequate for revolvers since cartridges will headspace on the cartridge rim on the cylinder and not the case mouth like an automatic pistol.

    The taper crimp die does not form a roll crimp on an automatic pistol cartridge, but will squeeze or compress the sides of the cartridge around the bullet base to prevent it from dislodging during cycling in the action. Force from the die is applied to the sides of the casing instead of the mouth this way preserving the case mouth for proper headspacing.

    Some of the taper crimping dies (at least the ones I use) will also reform the entire loaded cartridge to minimum SAAMI specs to ensure the cartridge is properly dimensioned to fit the chamber thus ensuring reliability. These work great if you haven't used one and produce excellent ammunition.

    Regards,

    Heavyiron

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    "If I don't see you nomore on this world, I'll meet you on the next one, and don't be late!" - Jimi Hendrix
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  • ATF
    I just discovered that Lee Dies made after 1986 will perform the taper crimp satisfactory.You can tell when Lee dies were manufactured by the last two digits stamped on the die.[^]

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    When a worm wants to relax,does he go fishing? "And remember a wet dog doesn't fly at night" "My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be." ATF,Eagle Guns
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  • joeaf1911a1
    ATF: Thanks for your info on the later Lee (from 1986 on). Didnt know that. Will check out when my set was made. Sure would save a step.
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