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  1. #31
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    Default Re: .223 rem. load data for my AR.

    Quote Originally Posted by Gerhard68 View Post
    @M43 Correct me if I am wrong as I am really new to the scene but, to my knowledge, the 5.56 has a thicker case wall which in turn means the case volume is less by a certain factor.

    Using the same load for the .223 cases and the 5.56 cases would result in the 5.56 cases being a hotter load compared to the .223.
    I recently weighed ALL of my 5.56 / .223 brass because I found a certain type of powder that wasn't close to max almost filling the case to the mouth. (Two buckets full of brass). And I experimented with the loads in different capacity cases.

    Commercial 223 PMP brass must all be NATO spec 5.56 if thicker sidewalls and less case capacity is the deciding criteria...

    Mil-spec 5.56 brass with crimped primer pockets and the NATO acceptance symbol in the head stamp must for the same reason be commercial .223... Fucking confused yet? (This was with Federal and Winchester as well as Austrian 5.56 cases)

    Chinese Milsurp, American and Austrian "NATO / Mil spec all had about the same capacity and weighed between 93 and 96 grains average. A few came in at 91.something.

    PMP commercial .223 and crimped Milsurp M193 weighed 105 to 108 gr on average. A small percentage were 109 to 110 gr.

    The PMP commercial .223 does an easy 3200 fps from my 16 inch AR, as does most decent "milspec" ammo.

    The heavy cases give about 70 - 100 fps more (With my reloads) than the lighter cases, for the same amount of powder.

    This causes me to believe that there are only 2 kinds of ammo. Hot or Medium. The headstamps means nothing. Some supposed Mil-Spec 5.56 is tame and some commercial .223 is super / Seal team Delta ADT Hot... Case wall thickness in PMP may play a role, but in Fed, Win and Hirtenberg the case walls are as thin (and capacity the same) as Norinco / PMC etc.

  2. #32
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    Default Re: .223 rem. load data for my AR.

    Further to the above...

    I would way all my cases if I wanted to load close to max with certain powders. And I for one won't attempt a max load with IMR4166 with PMP .223 cases. (I don't like that crunch noise when seating bullets...)

    I never bothered weighing cases using S321. But I have seen the light now. I got one or two extreme spreads with IMR4166 in the same weight cases as low as 6fps! (Same thing with S321). and that was with mixed headstamps. When mixing different weight cases extreme spread in some cases measured almost 80fps with exactly the same load.

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