close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets

Reply

Recording Crimp in reloads

LinkBack Thread Tools Display Modes
  #1  
Unread 06-22-2012, 12:11 PM
Junior Member
 
Join Date: Jun 2012
Posts: 4
Recording Crimp in reloads

ok, so i've been reloading for a couple years and getting comfortable with it. however, as I have been recording my load data for the different guns, I realized that there doesn't seem to be any description on crimping.

In other words, how do I record how tight of a crimp I put on a setup? A roll-crimp, I can eye-ball the depth the roll goes into the canulure (sp?) of the bullet.

But a taper crimp... Hmmm... I've started by getting a measurement of the case diameter after the crimp (I don't mix brass), so I'll see if this gets me what I want after a few different loads.

Or should I do my test crimp and measure it by how many whacks it takes to pull the bullet in the bullet-puller hammer?

Thoughts?
Reply With Quote
  •   #2  
    Unread 06-22-2012, 08:09 PM
    Platinum Member
     
    Join Date: Jun 2007
    Location: Wilmington NC
    Posts: 4,751
    Re: Recording Crimp in reloads

    A "crimp" is not needed or desired for rifle cartridges. If bullet retention is an issue, you simply go to a bushing die with a tighter sizing of the neck.

    Roll crimps are the preferred crimp in heavy recoiling revolvers, while most cartridges for automatics use a taper crimp die.
    Reply With Quote

      #3  
    Unread 06-22-2012, 08:23 PM
    Platinum Member
     
    Join Date: Feb 2009
    Location: Sedalia, MO
    Posts: 1,256
    Re: Recording Crimp in reloads

    Personally, I'd recommend the Lee Factory Crimp Dies for really heavy recoiling revolvers, but aside form that am in agreement with BountyHunter. Taper crimps for semi-auto pistols, and no more than necessary to secure the bullet from movement during feeding. Aside from Tubular Mag rifles like the M94 or Marlins, rifles generally don't benefit from crimping, and most actually suffer a loss of accuracy.
    __________________
    Kevin Thomas
    Lapua USA
    Reply With Quote
      #4  
    Unread 06-24-2012, 10:20 PM
    Silver Member
     
    Join Date: Mar 2008
    Location: SD
    Posts: 332
    Re: Recording Crimp in reloads

    Reloaders Consistent Crimp Products by Precision Accuracy Co.


    you might consider this.
    Reply With Quote
      #5  
    Unread 06-25-2012, 01:30 PM
    Junior Member
     
    Join Date: Jun 2012
    Posts: 4
    Re: Recording Crimp in reloads

    Thanks for the replies. Was looking for a way to measure the amount, rather than the type of crimp to apply.

    I'm not ready to invest in the precision crimp tool, yet. Was hoping to find a method to measure crimp so I can pass to a friend to reproduce a load, or even if I were to reload on someone else's machine.
    Reply With Quote
      #6  
    Unread 06-26-2012, 08:13 AM
    Platinum Member
     
    Join Date: Dec 2005
    Posts: 2,483
    Re: Recording Crimp in reloads

    Quote:
    Originally Posted by bedlam View Post
    Was looking for a way to measure the amount, rather than the type of crimp to apply.
    You can measure the force required to pull a bullet from a loaded round by making a simple tool. Put a bullet puller in a board clamped to a work bench top. Make something to hold onto a shell holder (spare ram for a press?) with a bucket attached to fill with weights. Put a sized case with bullet seated and crimped in place in the bullet puller, slide the shell holder onto the case rim, then start putting stuff in the bucket. When the weight finally pulls the case off the bullet, weigh the bucket and its contents and record the weight. Do this several times to get an average and spread of force needed.

    I've done this comparing crimped case mouths to uncrimped ones. Crimping rifle case mouths onto bullets tends to increase the force spread to get the bullet out; especially on bullets without cannelures. And crimping case mouths onto bullets without cannelures tends to unbalance them a little bit. That added variable tends to make ammo less accurate in proper tests.
    Reply With Quote
      #7  
    Unread 06-26-2012, 09:22 AM
    Junior Member
     
    Join Date: Jun 2012
    Posts: 4
    Re: Recording Crimp in reloads

    Bart, that is what I am looking for. Awesome idea. Now, here's another question....

    The only bullet puller I've used is the impact version. I don't suppose you have a recommendation for what you are using. I see several out there, but I've never used this other style, so I'm unsure on what would work over the others.

    Thanks for the help.
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: Recording Crimp in reloads
    Thread Thread Starter Forum Replies Last Post
    Crimp or not? justinp61 Reloading 6 08-06-2011 07:11 PM
    do you crimp? I SHOOT STUFF Reloading 13 01-04-2011 07:18 PM
    should I crimp? diderr Reloading 5 03-20-2008 08:19 PM
    crimp or not reed Reloading 1 03-02-2008 11:13 AM
    To crimp or not to crimp? BigDaddy0381 Reloading 47 08-31-2007 11:33 AM


    All times are GMT -5. The time now is 04:40 PM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC