1st 10mm reload bullets were keyholing

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    johnsopi

    Member
    Feb 8, 2018
    88
    The bullets 180 grain plated Berry, the gun Glock 20 ,the powder wasLongshot 7.5 and 8 and 8.5 gr. I used a light crimp. Shot 10 of each all keyholed. No point in shooting more. The Berry are .401 dia. And I checked and they seem to be.401.
    I have shot magtech 180 they shoot fine.
    Should I put more of a crimp? Oal. 1.260 I used to load a lot of 357 and never had a problem but this is the first time I've loaded Auto cartridges
     
    iH8DemLibz

    iH8DemLibz

    When All Else Fails.
    Apr 1, 2013
    25,396
    Libtardistan
    Some bores don't like some bullets. If the bullet is too soft, it won't grab the rifling. If the rifling is too shallow, it won't grab the bullet. If the rifling is too fast, it won't grab the bullet. The bullet will be pushed through the bore without spinning. Causing tumbling.

    I have a .45LC rifle that keyholes some bullets.

    I'd get better accuracy by throwing them downrange.

    Move to a manufacturer that produces true copper jacketed bullets and you'll have better results.
     
    jimbobborg

    jimbobborg

    Oddball caliber fan
    Aug 2, 2010
    17,119
    Northern Virginia
    Maybe your bullets don't like the polygonal rifling in the Glock barrel. I've never had a problem with plated bullets like that with any other pistol, unless I did something dumb like shoot five rounds of 44-40 through a .45 Colt revolver.
     
    John from MD

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,904
    Socialist State of Maryland
    Poly rifled barrels are sometimes finicky with lead bullets. The Berry's have a thin coat of copper but are really just a lead bullet. The loads you are using are for jacketed bullets. Try bumping them up a couple of grains. You will still be below the max pressure due to the elasticity of lead.
     
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