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Magnum Primers

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6 comments

  • SW 357Mag
    When is it appropriate to switch from standard primers to magnum primers? I can see a need when using large amounts of powder in large cases(375 h&h) but what about smaller cases (22-250)? Has any one come up with a hard and fast rule. Most reloading manuals seem a little vague.[?]
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  • PJ
    You need to work up new loads when you change any component.
    Pete
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  • perry shooter
    +1 on PJ if you are near MAX with standard primers you will be over max with magnum primers.
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  • bpost
    From my experience in pistol rounds going to a mag primer is about equal to .5 grain of powder. If you are shooting mild plinking loads there will be no problem.

    It is when you are in the upper level of the book loads that substituting a mag for reg primer can be a problem.

    If the price is right buy them all.... They are going to continue to skyrocket in price. Plinking with a cheap mag primer is better than going broke plinking with a standard primer in my book.
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  • mbsams
    If you didn't know the answer to this fundemental reloading question I strongly suggest you get a reloading manual and read it cover to cover - twice! Never take the word of strangers on the internet in matters of safety! Double check all opinions with the "books"
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  • SW 357Mag
    My manual shows charges from 3.6 - 4.0

    I stay around 3.7 - 3.8 with standard primers. I believe I'll pick them up and load 3.4 gr or so and see what happens.
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