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Thread: Number 34 Primer with .303 British

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  1. #11
    Really Senior Member Bruce_in_Oz's Avatar
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    I guess it also depends on your chosen propellant..

    US powders like 3031 and 4895 are excellent for driving 150gn bullets from a .303. You can happily ignite those powders with ANY "standard" Large Rifle primer.

    I stared reloading Boxer-primed .303 with Remington 9 1/2 primers fifty years ago. Later, I moved to CCI standard Large Rifle primers , partly because, in these parts, they became easier to find than the Remingtons and they seemed to be a little "tougher" in "stiff" hunting loads in .30-06. Thicker cups?

    Regardless of the cartridge, the usual caveats apply:

    HEADSPACE, Max load warnings, triim length, flash-hole diameter, striker protrusion and radius, striker /striker hole "fit". etc.

    If you are loading heavier bullets , eg. 180gn and above, a slower powder is advised. Endless good data in print and on line out there, Powders, primers and bullets come and go over time, so you need to keep current with data..
    Last edited by Bruce_in_Oz; 11-28-2021 at 04:32 PM.

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    Senior Member AD-4NA's Avatar
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    Quote Originally Posted by Parashooter View Post
    Beware of internet assertions that the CCI #34 is a "hard" primer. There is credible evidence that the cup is the same as other CCI primers but that the anvil is in fact shorter.
    https://www.milsurps.com/attachment....50&cid=1&stc=1

    Quote Originally Posted by Low & Slow View Post
    Your pic makes your point well. I'll bet this would pretty well absorb the forward inertia of a free floating firing pin, preventing a slam fire. Thanks for illustrating how this primer actually performs this function.
    Interesting, that would explain how it could survive dimpled primers in M1icon Rifles all the time.
    Sounds like no one has tried it in .303 though.


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