Crimp Die

This is a discussion on Crimp Die within the Reloading forums, part of the Defensive Ammunition & Ballistics category; I am going to start reloading 357 mag/ 38 spl. I have a Dillon 550b press with like dies. I know that I need to ...

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Thread: Crimp Die

  1. #1
    Member Array johnnyrigger's Avatar
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    Question Crimp Die

    I am going to start reloading 357 mag/ 38 spl. I have a Dillon 550b press with like dies. I know that I need to have a Roll crimp. So my question is this can my Dillon Dies produce a Roll Crimp or just a taper crimp?

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  3. #2
    Distinguished Member Array coffeecup's Avatar
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    My best guess is that Dillon is way ahead of you on that one and the dies for rimmed,straight wall revolver ammo will roll crimp.

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    Member Array laeckcrov's Avatar
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    One thing i've learned about Dillon: If you want it, they probably have it, and have been making it a while.
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    VIP Member Array SatCong's Avatar
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    Quote Originally Posted by coffeecup View Post
    My best guess is that Dillon is way ahead of you on that one and the dies for rimmed,straight wall revolver ammo will roll crimp.
    Your right, roll crimp, it is.
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    If you buy from Dillon, the 3 die set will include what Dillon calls an "accu-crimp" which is sort of a combination roll crimp/taper crimp hybrid.

    Personally, I like the taper crimps better than staight rolls crimps.They hold tighter and case length is not an issue. If your cases are'nt all exactly the same length, with a roll crimper the short cases wont get as much crimp and the long cases can get too much, making for erratic groups.

    Some will argue that the revolvers must have a roll crimp, but I have'nt had an issue in over 30 years of reloading with the taper crimps and I have reloaded lots of ammo.Dillon does a good job with their dies for this.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


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    VIP Member Array SatCong's Avatar
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    Quote Originally Posted by HotGuns View Post
    If you buy from Dillon, the 3 die set will include what Dillon calls an "accu-crimp" which is sort of a combination roll crimp/taper crimp hybrid.

    Personally, I like the taper crimps better than staight rolls crimps.They hold tighter and case length is not an issue. If your cases are'nt all exactly the same length, with a roll crimper the short cases wont get as much crimp and the long cases can get too much, making for erratic groups.

    Some will argue that the revolvers must have a roll crimp, but I have'nt had an issue in over 30 years of reloading with the taper crimps and I have reloaded lots of ammo.Dillon does a good job with their dies for this.
    For me on mag loads, I like roll crimps, don't want the bullet to move under heavy recoil.
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    I've never had a bullet move with a taper crimp.

    Kinetic bullet puller with a roll crimped bullet in it....3 to 4 whacks to get the bullet out.

    Kinectic bullet puller with a taper crimped bullet in it... 6-8 whacks to get it out.

    Taper crimp holds better.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


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  9. #8
    VIP Member Array SatCong's Avatar
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    Quote Originally Posted by HotGuns View Post
    I've never had a bullet move with a taper crimp.Kinetic bullet puller with a roll crimped bullet in it....3 to 4 whacks to get the bullet out.

    Kinectic bullet puller with a taper crimped bullet in it... 6-8 whacks to get it out.

    Taper crimp holds better.
    I have with a 44 mag, full load.Even the books say heavy loads in mags should have a good heavy crimp.The heavy crimp also works better with slow powders.
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    Member Array johnnyrigger's Avatar
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    cool so ill just make a small batch of each and have a range day and see how it all works out. thanks all for the good info. can I look at my crimp die and tell what it is? IE roll/ taper crimp?

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    Member Array Ghuqu2's Avatar
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    Use a Lee Factory Crimp die.
    "The millions of people, armed in the holy cause of liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us." Patrick Henry 1775

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    Distinguished Member Array coffeecup's Avatar
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    Johnny--remove the seating punch and take a look inside the die from the bottom end. A taper crimp die probably wont have the small "step" inside that some roll crimp dies do.

    I've been reloading since the early 1950s' and long ago figured out that for high intensity habdgun loads the factory has it right--use a roll crimp and bullets with a channelure and save yourself from setback woes.
    marcclarke likes this.

  13. #12
    Member Array johnnyrigger's Avatar
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    Thank you MR Coffee!! it has the step inside the die. thank you

  14. #13
    Distinguished Member Array coffeecup's Avatar
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    NO problem Johnny.

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