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Switching primers...

Discussion in 'Handloading and Reloading' started by altitude_19, Jul 30, 2010.

  1. altitude_19

    altitude_19 Well-Known Member

    If you switch from one brand of primer to another, do you feel the need to re-work the load back up to what you had? For example, switching from Winchester LP to CCI LP: Would you start back at minimum load, or just keep using what you had?
  2. JimKirk

    JimKirk Well-Known Member

    Going from Win LP to CCI LP no, If I was going CCI to Win LP and loading border line Max loads, I may back down 2%, but not 10%. The WLP is rated for both regular and magnum loads.

    Jimmy K
  3. qajaq59

    qajaq59 Well-Known Member

    I just back it off a little and then come back up to accuracy. I don't start at the minimum however. It rarely seems to make a big difference in my rifles though.
  4. loadedround

    loadedround Well-Known Member

    I've seen very little difference in switching various brands of pistol primers. However I'm not pushing through maximum loads and mixing or matching various brands of primers.
  5. Walkalong

    Walkalong Moderator

    If you are not at max, don't worry about it. I haven't compared the WLP & CC 300 primers, but with the WSP & CCI 500 primers in bigger cases with lots of extra air space I have to up the powder .1 or .2 Grs with CCI to get the same velocity. In small cases where powder fills 95% of the air space it did not seem to make much difference.
  6. bds

    bds Well-Known Member

    Loading for 9/40/45, Winchester LP/Wolf LP and Winchester SP/Magtech SP seem comparable to use the same charge load.

    For PMC "E" SP, depending on the powder, I need to use on average about 0.2-0.3 gr more powder to be comparable to Winchester SP/Magtech SP.

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