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CCI 300 and WMP primers for what bullets/loads??

Discussion in '10mm Reloading Forum' started by tammons, Jun 18, 2011.

  1. tammons


    Mar 31, 2009
    Have 1000 each of CCI 300 and WMP primers and 800X.
    Starline brass.

    Which is best for what loads ??

    I dont want to work up a load with one primer than have to rework it later. The only round I have worked up so far is 180 gr XTP over 800x with WLP primers.

    Right now I have...

    135 gr nosler JHP

    180 gr XTP

    200 gr beartooths

    .395 balls to load under the 135 gr JHP for a similar DT load.

    Will probably buy some 155 gr win Silvertips later.

  2. Taterhead

    Taterhead Counting Beans

    Dec 13, 2008
    Boise, Idaho
    Confused. You mention "WMP" primers but I think you mean "WLP."

    That being said, I like the 300s for all of the bullets you mention except for the two-projectile combo - I have no experience with loading that.

    Generally speaking I go with the lightest primer that gets the job done. That is especially true with 800-X. Unlike any powder that I have used, 800-X seems sensitive to primer choice. The extra spark of mag primers and "in-between" WLPs exhibited higher pressure indications at comparable velocities than with standard primers.

    If it were me doing load workups with those components, I would go with the 300s. Having loaded all three bullet types with 800-X, the 300s performed the best.

    I would reserve the Winchester primers for a different slower powder like Accurate No. 9.

  3. Kegs

    Kegs Ol 8 fingers ;)

    Oct 26, 2009
    Cold side of conus
    300s will work for most anything. Same for Remington # 2 1/2 primers. I don't know about those Win primers - I've not used them.

    CCI350s will give you problems in the lighter bullet weights.

    I won't bother using magnum primers anymore with the 10mm
  4. tammons


    Mar 31, 2009

    I will stick with the 300's