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5.7x28 What's it good for?

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  • zackmars

    Free 1911 refinishing
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    Nov 4, 2015
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    That was Melvin Johnson with his 5.7 Spitfire carbine the very first PDW, that never was.
    5.7 spitfire never made it past the wildcat stage, which is a shame because it's a great cartridge, and the best of all the various necked down .30 carbine cartridges out there
     

    candcallen

    Crotchety, Snarky, Truthful. You'll get over it.
    Emeritus - "Texas Proud"
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    2   0   0
    Jul 23, 2011
    21,358
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    Little Elm
    Well you can't get it because 5.7x28 won't even scratch a SAPI plate at 10 yards, much less 200.
    5.7x28 ss190 out of a 10 inch, iirc, barrel will Penetrate esapi plates at 200 yards. Level 3 plates I believe.

    The non ap stuff we can get won't. Which is why my qualifier of ammo ww can't get.

    The whole point of the 5.7 and p90 was developed to penetrate such armor at 200 yards with the ss190 ammo.

    Without it it is a hot 22 mag load. Kinda.
     

    zackmars

    Free 1911 refinishing
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    Nov 4, 2015
    5,609
    96
    Texas
    5.7x28 ss190 out of a 10 inch, iirc, barrel will Penetrate esapi plates at 200 yards. Level 3 plates I believe.

    The non ap stuff we can get won't. Which is why my qualifier of ammo ww can't get.

    The whole point of the 5.7 and p90 was developed to penetrate such armor at 200 yards with the ss190 ammo.

    Without it it is a hot 22 mag load. Kinda.
    Level III is rifle rated, IE, .308 M80 ball.

    Lvl III will stop M855 or M193 past 50-75 yards 100% of the time (depending on barrel length), much less 5.7x28.

    AP is not magic, and there is no bullet technology out there that will turn 5.7 at 200 yards into 5.56 at 50 yards, or say .30-06 M2AP



    AP 5.7 will go through IIIa, as will .30 carbine FMJ or 7.62x25 FMJ
     

    PinnedandRecessed

    Allegedly
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    Feb 11, 2019
    2,780
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    Hays County
    Leonardo DiCaprio Laughing 23112022221038.jpg
     

    glenbo

    Well-Known
    Lifetime Member
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    3   0   0
    Sep 3, 2014
    2,231
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    San Leon
    So as a niche cartridge with little use in the real world that isn't already covered by others, it's great. It's still expensive and rare, true?
     
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