USPc slide wrecked by shooting 357 Sig? - Page 2
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Thread: USPc slide wrecked by shooting 357 Sig?

  1. #11
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    The slide looks damaged. It is the mating point between the front of the barrel hood and the ejection port. Could it be that the 357 barrel was not properly fit? I would look at the 357 front locking lug to verify.

  2. #12
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    Slide is definitely damaged. Barrel appears to move excessively fore and aft when in battery. IDK if there's a factory spec for this.
    Absolutely no damage to any area on either barrel. And, externally they're dimensionally identical

  3. #13
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    What is round count on this pistol and at what round count recoil spring was replaced?
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  5. #14
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    Quote Originally Posted by Taoman View Post
    Neighbor dropped by asking my opinion on his USPc.
    Seems he purchased it (40 S&W) ~ 20 years ago.
    Shot it some then purchased a HK 357 Sig barrel for it.
    Handloads 125 grain with Power Pistol about 1250 fps.
    Nothing like Underwood or similar.
    The slide at the locking point has peened peened back about .015".
    I measured both barrels and they are dimensionally identical as far as I can tell.
    Both exhibit no damage, but only show similar rub marks.
    Hard to image but this shows the damage:
    Attachment 245838
    Only thing I can imagine is that the heat treatment or alloy on 40 slides differs from the 357 ones.
    Just wondering if anyone has experienced this type damage or has any theory as to the cause.
    At minimum looks as if he will be in the market for a replacement slide.

    Did your friend actually use a Chronograph and came up with those numbers ... OOOORRRRR......

    Did he just tell you it 'felt like' 1250 fps and did NOT run it over a chrono?

    That will tell you everything you need to know.

    Which is it?

    And it appears that Underwood makes .357 sig bullets from 125 up to 180. Could he have reloaded a heavier bullet than he thought?

    This is the main reason that NO ONE approves handloads, because you cannot know what was actually shot...
    Last edited by wallew; 11-19-2019 at 04:18 PM.
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  6. #15
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    Off the online Alliant Powder (Power Pistol) table: 357 Sig, 147gr Speer GDHP, Power Pistol 7.5gr, 1152 fps.
    125gr x 1250 fps isn’t too far off, but at what grains/wt charge?
    Heat treating, the USPc 9/40/357 use the same frame, the 40/357 with just different barrels. I don’t see why the 45/9/40/357 would have different slide heat treating (materials/steel are the same).

  7. #16
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    Quote Originally Posted by wallew View Post
    ....And it appears that Underwood makes .357 sig bullets from 125 up to 180. Could he have reloaded a heavier bullet than he thought?
    ....This is the main reason that NO ONE approves handloads, because you cannot know what was actually shot...
    Amen. Anything goes with handloads. Not recommended.

  8. #17
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    Call HK and see what they could do for you.
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  9. #18
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    8 Grains of PP is the load he used.
    I doubt it even made 1250.

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