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Can I shoot lead SWC in my H&K USP 45ACP?

Wulfmann
I bought a DA only H&K USP 45ACP.

It looks to me like it has regular grooves in the barrel and not a polygonal bore.

So, that would indicate i can shoot lead 200gr SWC that I sue in my 1911 type pistols.

Before I do so I thought I would mention it here in case those grooves in the barrel alone do not allow lead bullets

What say "Sie Experten"?

Wulfmann
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Comments

4 comments

Date Votes
  • jonk
    It should be no problem if it has conventional rifling. One thing to watch out for is the throat; if your 200 gr SWC chamber ok (or if you adjust seating depth to suit) you should be just fine.

    Even with polyagonal rifling, a lot of guys over at the cast boolit forum have tried it and found it isn't an issue, but it isn't something for a casual cast shooter to try- you have to really know what you are doing with bullet hardness, fit, and lube, to make sure you won't have any leading BEFORE attempting it- as it is rapid leading and bore constriction that generally makes this a no-no in polyagonal rifled guns such as the Glock and so forth.
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  • Emmett Dunham
    Unless someone changed the barrel in the H&K it has polygonal barrel from the factory. The don't like lead! I shot some lead through the Glock and it made a mess out of the barrel and took a long time to get clean. If you look real close you may be looking a flats in lieu of lanes and groves.

    Emmett
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  • rsnyder55
    I have one of the early HK USP's and it has grooved instead of polygonal rifling.
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  • 1KYDSTR
    Lead and polygonal rifling do not mix. Accumulation of lead in the 'grooves' will eventually tighten the bore up to the point where pressures become a real issue...potentially catastrophic.
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