Magnum primers in .40 S&W Cast Lead Reloads

This is a discussion on Magnum primers in .40 S&W Cast Lead Reloads within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Warning: CombatCarry CCW is not responsible for this load data. Frankmako is not responsible for this load data, except in my guns. Do not shoot ...

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Thread: Magnum primers in .40 S&W Cast Lead Reloads

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    Magnum primers in .40 S&W Cast Lead Reloads

    Warning: CombatCarry CCW is not responsible for this load data.

    Frankmako is not responsible for this load data, except in my guns.

    Do not shoot cast lead bullets and/or any reloads in any factory Glock .40 cal barrel. Glock factory .40 cal barrels do not fully support the case. Do not shoot any cast lead loads in any factory Glock barrel; Glock barrels are not made for cast lead bullets.
    Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet length will alter net case capacity, pressure and velocity. Primer selection is specific and primer types are not interchangeable. These are loads that work in my firearms and may easily be excessive in others. All loads should be reduced by 10%, and developed following safe hand loading practices as represented in established reloading manuals produced by component manufacturers. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.


    Last summer I worked up a lite cast lead load for my Glock 23. This load groups well, has low recoil, and is easy to shoot. But, has lots of unburned powder and is dirty.

    The load is:

    Gun: Glock 23 with a KKM Precision barrel.
    Bullet: Tennessee Valley 180 gr TCFM cast lead.
    Powder: 6.0 grains of Accurate #5
    Primer: CCI 500 small pistol.
    Brass: Used Speer.
    Bullet Seat: 28.00mm
    Velocity: 830 fps over my old Pro-Tach chronograph.
    Dies: RCBS
    Press: Dillon 550 (one of the first made)

    So, I did the same load but I used Winchester magnum pistol primer, # WSPM in placed of the standard primers. I got a cleaner burn of the powder and the rounds felt like factory ammo. But is still dirty.

    Ran the new load across my Pro-Tach chronograph to see what is the different in velocity between the primers.

    Here is what I got: Standard primers: 830 fps.
    Magnum Primers: 877 fps.

    The magnum primers were 47 fps faster than the standard primers. Not worth the price different between the mag and standard primers. I have used magnum primers in many different pistol loads before, but I donít think I will use them in the .40 S&W.

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