Accuracy vs Crimping

Discussion in 'The Ammo & Reloading Forum' started by steve4102, Oct 1, 2012.

  1. steve4102

    steve4102 Former Guest

    Jan 27, 2006
    I know I have posted my accuracy tests using the Lee Factory Crimp die in the past, so I hope you don't mind if I do it again.

    I purchased a K of Midsouth's 55gr Varmint Nightmare JHP bullets for about $90.

    I decided to test this new to me bullets in my Colt AR both with a Lee crimp and without. My crimp is what I call a Med-Light.

    I chose Win 748 as it has worked well for me in the past with 50-55gr bullets.

    I fired five rounds at each target allowing the barrel to cool between each five round group. This is the first set of groups.


    I then fired five shot groups from the bottom up starting at 26.5gr and working up the target to 25gr. I did not let the barrel cool at all. The only down time between rounds was loading the mag.


    As you can see these bullets shoot damn good for cheap bullets and you can see that the rounds crimped with the LFCD outperformed the non crimped rounds.

    26gr Crimped is a winner in my book.
    Last edited: Oct 1, 2012
  2. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas
    And you have a real winner with 25.5-26 gr W748 and those bullets. ID personally call 25.8 my load.

    Good thread steve. :thumbsup:

  3. woolleyworm

    woolleyworm Well-Known Member

    Feb 23, 2009
    SW Fort Worth
    I'll second the thumbs up! Great visual documentation and clear results. The LFCD is worth the extra effort.
  4. aa1911

    aa1911 Well-Known Member

    Dec 12, 2010
    Pacific Northwest
    thanks for the good write up!

    isn't 748 the same powder used in military ammo for the 5.56? thought I read that somewhere recently.

    Hodgen has their new .223 specific powder out now too, supposed to be even cleaner burning and 'cooler'/easier on the barrels. but the military stuff burns just fine as far as I care.
  5. myfriendis410

    myfriendis410 Member

    Mar 30, 2011
    Lompoc California
    What was your distance?

    A crimp can certainly improve consistent velocity numbers which (usually) make for a more accurate load.

    Nice workup.
  6. steve4102

    steve4102 Former Guest

    Jan 27, 2006
    Sorry forgot that, 100 yards
  7. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas
    As far as I understand milspec 5.56 ammo is loaded with bulk grade W748. It was developed for longer barrel life in the M16s and increased performance.

    And that CFE223 your are referring to. Awesome stuff. it prevents copper fouling. Burn speed is close to W748.
  8. bluesea112

    bluesea112 Active Member

    Nov 20, 2005
    West, TX
    I have always heard that crimping is better for accuracy, but it is nice to see it proven on paper.
  9. Bindernut

    Bindernut Well-Known Member

    Oct 24, 2007
    ND, USA
    Very nice documentation Steve!
    Just out of curiosity, but I notice how on-target the groups are. You didn't have any major POI change through that range of charge weights? I haven't ladder tested my .223 yet.

    To date, I haven't messed around with the LFCD in any caliber.
    I have picked a couple calibers up when they've been on sale but I honestly have never threaded them into a press yet. :eek:
    I'll have to put forth a little more effort to give em a try some time.
    I do use a crimp on any cannelured bullet for my rifle loads, but just what I get from the particular brand seating die that I'm using.
    Last edited: Oct 3, 2012
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