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  • Steel 7.62×51?

     Jessica updated 1 month ago 2 Members · 7 Posts
  • Jessica

    Member
    September 15, 2021 at 4:16 pm

    Hey all, coming from the AR world you always hear that steel case wears on your parts a little more due to 556/223 being a high pressure and fast round and ARs just being designed for brass. More recently I’ve gotten in to the AK world where steel is the go to and I’ve learned that 7.62×39 isn’t a barrel burner and is a slower round. So my question is, what about 7.62×51? I have a PTR91 that I’m trying to stock ammo for, and it ain’t cheap. I know it takes a while to burn out a barrel with steel in an AR, but a HK pattern barrel involves more work. So is steel case bi-metal 7.62×51 closer in comparison to 556 or 7.62×39? Thanks in advance

  • Brandon-Quixote

    Guest
    September 15, 2021 at 4:16 pm

    Steel is slightly harder on the extracting mechanisms and parts. If anything steel is LESS hot than brass ammo, on average. You would wear your barrel out faster with the heat of mag dumps than you will with steel ammo. The case doesn’t go past the chamber or touch rifling, case material alone doesn’t have an effect on barrel life. 5.56 and .308 aren’t barrel burners like .270 Win or 204 Ruger that toast barrels in 5k rounds. Jacket material will matter, bimetallic could be more abrasive but something with natural lubricity like copper FMJ is just fine. Plus a G3 pattern will eject anything into orbit and flute the fuck out of the case, regardless of material.

  • pestilence

    Guest
    September 15, 2021 at 4:16 pm

    There are two separate issues at work here. One, 7.62×39 is easy on barrel life because the velocity is only around 2000 FPS. 7.62×51 and 5.56 are typically between 2800 and 3200 FPS. Two, steel CASE ammo is no worse for barrel life than brass. Steel JACKET bullets do wear barrels faster.

  • Interesting-Poet-258

    Guest
    September 15, 2021 at 4:16 pm

    On all platforms the extra wear is negligible. If anything the savings you get from shooting steel allows you to buy another barrel

  • hotel_torgo

    Guest
    September 15, 2021 at 4:16 pm

    7.62mm NATO has a similar chamber pressure specification as 5.56mm NATO. Both quite a bit higher in pressure and velocity than 7.62x39mm. I would expect bimetal jackets to wear a 7.62mm bore slightly more rapidly than copper/tombac jacketed projectiles. But it’s really negligible, it’ll take probably close to 10k rounds to shoot out a $200 barrel

  • Watney_Actual

    Guest
    September 15, 2021 at 4:16 pm

    Higher velocity rounds will burn out barrels faster, yes.

    The case has nothing to do with barrel wear.

  • coldafsteel

    Guest
    September 15, 2021 at 4:16 pm

    Lolz! Steel 5.56 is 100% fine, no ill effects. I have shot a lot of steel 7.62 in my SCAR and it has left no ill effects. Anyone that really belies that steel case ammo and bimetallic bullets causes excessive wear apparently can’t read. There have been several published studies that prove otherwise.

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