A testament to the quality of HK barrels
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  1. #1
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    Default A testament to the quality of HK barrels

    One of the Moderators on the HK forums just got this HK USC barrel for inspection. Looks quite obvious to me but glad I wasn't the guy stacking them up.

    hk-barrel.jpg

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    That is a lot of lead!

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    I saw that before a year or 2 back, the story was wild. I dont remember if it was a HK or not. but holecreek would know.

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    Quote Originally Posted by CalG View Post
    That is a lot of lead!
    Yeah, I count maybe a dozen rounds......crazy!

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    G'Day Fella's,

    Thanks for sharing g-coder 05!

    That amount of "Barrel Fouling", will be dificult to remove .................

    D'oh!
    Homer

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    I'm more curious to see how the bolt held up from all of that pressure. I saw a picture a few years ago of some one that tried to shoot .300 Blackout through a standard .223 barrel. It was amazing to see how long that bullet got squeezed to before it stopped mid barrel.

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    Somewhere I have a picture of a H&K .45ACP SMG barrel that I sectioned. The Police Department was training on range with that and .40S&W Glocks. A .40S&W round got mixed with the .45ACP as they where loading mags. They fired a short burst, got misfire, pulled bolt to rear, checked chamber and fired another burst. Bolt blew out rear of gun. Found a .40S&W in bore with a .45ACP bullet behind it.

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    I've got a pic of an 80gr bullet in a 223 that ran into a cleaning rod. I'd rate neither one victorious. The action survived to fight another day, with some work to the bolt face.

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    I remember reading about a Mauser rifle proof testers deliberately blocked and fired. I don't remember the caliber but it was one of the 8mm/30'06 class. The action survived and the gas leaked out. It seems to me that much of the pressure is due to the gases being very hot and when they cool, even if none leaked out, the remaining pressure would not be that high. I would assume they will more or less follow Boyle's law, but I don't know the temperature of burning gunpowder.

    Does anyone know more about the subject?

    Bill

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    So, what is this thread about, blowing up receivers or coppering up a barrel?

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    Both MG Julian Hatcher "Hatchers Notebook" and P. O. Ackley's books have chapters on blowing up rifles.

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    A short note. When I did a week long armorer's course at the HK factory in 2009, I was told the barrel alloy is M35. It starts in the annealed state is then drilled and hammered and the OD finished. They are then sent out for HT. After return, rifle barrels are inspected and straightened by eye and hand if necessary. The barrel straighteners are the highest paid workers in the factory.

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    I just did a search on M35 and it is listed as a tool steel here https://www.steel-grades.com/Steel-G...Alloy/M35.html

    are you sure this reference is correct or is it a german reference and have looked up the wrong one?

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    Quote Originally Posted by Street View Post
    I just did a search on M35 and it is listed as a tool steel here https://www.steel-grades.com/Steel-G...Alloy/M35.html

    are you sure this reference is correct or is it a german reference and have looked up the wrong one?
    Sorry, I misquoted, I was told M32 not M35.


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