close

Privacy guaranteed - Your email is not shared with anyone.

Welcome to Glock Talk

Why should YOU join our Glock forum?

  • Converse with other Glock Enthusiasts
  • Learn about the latest hunting products
  • Becoming a member is FREE and EASY

If you consider yourself a beginner or an avid shooter, the Glock Talk community is your place to discuss self defense, concealed carry, reloading, target shooting, and all things Glock.

CCI300 v. WLP primers with SR4756

Discussion in '10mm Reloading Forum' started by jeffreybehr, Aug 8, 2010.

  1. jeffreybehr

    jeffreybehr Silver Member

    765
    3
    Mar 14, 2009
    Phoenix, AZ USA
    I've been loading my 10mm exclusively with CCI300 primers since I've had it, but a couple weeks ago I discovered that Bruno's had Winchester Large Pistol primers in stock for $30.75, about $4 less than I was paying for the CCIs. Bought some and tested them, in 2 separate batches.

    Today's, more-reliable*, tests were of 25 rounds of each, shot in 5-shot groups, all chrono'd (but I didn't get 25-each readings due to hurried initial chrono setup) and shot from a rest at 10 yards. The basic load is new Starline cases, weighed charges of SR4756, and Montana Gold JHP155s. Today's load used 10.8g. The average velocities (with screens centered at 10 feet) differed by ONE foot per second (1365 v. 1364), statistically insignificant by anyone's definition. I measured 24 shots with the CCIs and 20 shots with the WLPs. The WLPs produced a standard deviation about half of what the CCIs produced, 10 v. 18FPS, and the WLPs' average group size was about 30% smaller than that produced by the CCI rounds.

    Friday's test results were somewhat reversed from today's, but with all 9 groups combined, the WLPs still produced smaller average group size and lower standard deviation.

    I'm staying with the WLPs. :supergrin:

    * that is, a larger sample size and more-pleasant shooting conditions
     
    Last edited: Aug 8, 2010
  2. Kegs

    Kegs Ol 8 fingers ;)

    2,688
    2
    Oct 26, 2009
    Cold side of conus
    Good to hear - Thanks!
     


  3. chippy

    chippy

    77
    0
    Jun 21, 2010
    Montana
    I have been using WLP primers because they were all I could find locally. No complaints here.