1911 9mm 147gr - am I inducing the POI height

st1650

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So I used to shoot exclusively a G19X with a DPP with 147 gr. I never worried about my POI because I've always just set my zero at 15 yards and it's hitting where I'm aiming.

Now I acquired a beautiful custom 9mm 1911 with traditional iron/fiber optic sights and even with a low 6 cloak hold, I'm hitting way way high (like a good 4-5in at 15 yards) the groups are fine and tight but the elevation is way too much and I even have adjustable sights and I've bottomed the adjustment and it's still way high, yet when I'm shooting 124gr, I'm dead on POA/POI.

Now I'm aware that there are poi shift when going from 124 to 147 but 5in at 15 yards is massive and I wonder if it could be me. I have really really really large hands and shoot strong hand thumbs over safety with support hand with the thumb riding the slide pointing forward. I also hook my support hand index finger around the trigger guard. I have good recoil control but I'm not sure what's causing this vertical difference beside the whole "subsonic bullets leaves slower therefore it gives more time the barrel to rise up".

I have 2 barrels on that specific 1911(including a very nice Kart custom fitted) and they both do the same.
 

Old Man with Gun

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Let some other people shoot it and see what happens. Probably not the ammo.
 

Modoc

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I had something similar happen with a 45 Colt when I went from 240g factory down to 200g CAS loads. If the POI does the same with other shooters, you will need to replace the front sight blade with a taller blade to push the POI down.
 

E. Bryant

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  • Oct 25, 2010
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    I've definitely seen this when shooting hot loads through revolvers, but I'm surprised that the very modest difference between 124gr and 147gr 9mm would cause such a difference. As @Old Man with Gun suggested, start with another shooter.
     

    cas6969

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    Nov 16, 2021
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    Yep. Try some “more traditional” 9mm loadings and see where they’re going. But in truth it’s probably God punishing you for shooting 9mm in a 1911.

    Jesus, John Wayne and John Moses Browning are very disappointed in you.


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