Primers?

This is a discussion on Primers? within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Reloading 40SW what is the Differance between Small pistol primers and Mag Small pistol primers? Ie CCI 500 & 550....

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Thread: Primers?

  1. #1
    Senior Member Array TomEgun's Avatar
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    Primers?

    Reloading 40SW what is the Differance between Small pistol primers and Mag Small pistol primers? Ie CCI 500 & 550.
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    Distinguished Member Array svgheartland's Avatar
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    No explanation in the Hornady manual. I've always assumed the magnum delivers a hotter ignitinon. Hornady does say "Never, under any circumstances, substitute a magnum primer for a load developed with standard primers"
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    Senior Member Array jem102's Avatar
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    They do have a higher brisance and the cup is thicker to take higher pressure.
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    VIP Member Array Stevew's Avatar
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    None of my manuals call for loads using small pistol magnum primers with the 40 S&W. Primers are pretty easy to find now. Just ordered some from Cabelas. Gander Mountain has them in stock. I see no reason to experiment. Magnum primers are for slow burning powders in large cases and has a longer flame duration. Avoid problems. Get the right components.
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    They do have a higher brisance and the cup is thicker to take higher pressure.
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    Senior Member Array TomEgun's Avatar
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    Thanks Guys !!
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    Distinguished Member Array kazzaerexys's Avatar
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    There was a thread here about...six months ago?...where someone posted chrono results of substituting magnum primers for regular (and, perhaps, vice versa). The short version is that the magnum primers resulted in higher chrono standard deviation but not much in the way of average velocity variation.

    I am afraid I don't have the thread bookmarked, but the general impression I had from that was as long as you weren't at bleeding edge loads, you could probably swap between standard and magnum.

    The basic practical difference is that a magnum primer is designed to be a bit 'hotter' in order to ignite powder spread over a larger case more quickly. I might experiment one of these days with magnum primers in my .45ACP Titegroup loads, as the powder doesn't fill the case very much at the velocities I shoot.
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    Senior Member Array rmilchman's Avatar
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    I remember reading if you use magnum primers for regular loads you should cut the powder about 10%.

  10. #9
    VIP Member Array frankmako's Avatar
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    i have used mag primers in the 40 s&w load. i don't load my 40 s&w hot so i dropped the same powder weight for the mag and standard primers. over my chronograph the mag primers gives me about 50 fps more than the standard primers.
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