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    muzzle erosion

    can anyone tell me how the muzzle erosion looks on this barrel. ammo used was federal 150 grain soft point commercial, which i know is not really a good test for this.

    #2
    You need to check it with US ball ammo. The ogive is different on commercial bullets. It looks pretty worn to me. Maybe a 5-6. Just a WAG.
    Jon

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      #3
      this is supposed to be a brand new criterion barrel on a cmp special grade m1

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        #4
        Its fine.
        Before the internet people never got hung up on MW measurements. Proof is on paper at the range

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        • mikeurbas
          mikeurbas commented
          Editing a comment
          thanks for the input !

        #5
        Orlando is right on the mark as usual.

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          #6
          Using a bullet to check muzzle wear is a total waste of time and effort. Anyone giving you an estimate based on a picture of a bullet test is wasting your time and everyone else's. Especially when the test is conducted with commercial ammo. Virtually every bullet manufactured has a different ogive depth and angle, including various Ball bullets. That makes your question impossible to accurately answer.

          Being it's a new Criterion barrel there's no reason whatsoever to doubt it's new with new barrel measurements. Questioning that is foolishness. Running out and buying a gauge to check it is a total waste of time and money.

          Why are you questioning it to begin with? With two threads even. A new barrel has no muzzle wear or erosion. Oh, and I've never once seen a new Criterion barrel that measured "0". Brand new post war SA barrels often measure 2 and 2+.
          Last edited by lapriester; 02-05-2019, 04:28 PM.

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          • mikeurbas
            mikeurbas commented
            Editing a comment
            the reason i was questioning it, was i bought the gun used, and was told it was never fired.

          #7
          Originally posted by mikeurbas View Post
          the reason i was questioning it, was i bought the gun used, and was told it was never fired.
          And the previous owner would have had to have shot several thousand rounds through the rifle in order to cause any significant muzzle or throat wear on that hand lapped, match quality Criterion barrel. If that were the case you'd see more wear on other rifle wear points all over the rifle. So, regardless, you are good to go. Don't worry about something not worth worrying about and just enjoy that rifle that will prove to be just as accurate as the person behind it can be. One thing you might consider, if you want best accuracy performance out of a CMP Special, is to do the almost always required stock fitting on that commercial stock. Most, if not all, need minor to moderate fitting to improve accuracy sometimes significantly.

          Look here on the CMP Forums:
          http://forums.thecmp.org/showthread.php?t=147599

          Quit fretting. It's extremely rare to get a bad CMP Special. Though really not collector grade rifles, they ARE essentially new rifles put together better than mixmaster arsenal rebuilt rifles thrown together often with well used battle worn refinished parts.

          Comment


          • mikeurbas
            mikeurbas commented
            Editing a comment
            thank you for your comments. i'm always a little worried when i pick up something at a gun show, but i think i did ok this time !

          #8
          Here are links to other stuff you might find interesting as a new Garand owner:

          https://www.dropbox.com/sh/mkgu0wn3x...g8mIaieTa?dl=0

          https://www.dropbox.com/sh/2wpk20vdj...0Qsxc3SVa?dl=0

          https://www.dropbox.com/s/jacqznbirb...arand.pdf?dl=0

          And here's some great stuff from a former Website if you plan on collecting any other vintage firearms in the future:

          https://www.dropbox.com/sh/kh9guf4wv...MKJajVKra?dl=0

          All that, LOL, should keep you busy for some time.
          Last edited by lapriester; 02-06-2019, 12:01 PM.

          Comment


          • mikeurbas
            mikeurbas commented
            Editing a comment
            thanks, for the info, as this is my first garand, having been a m1 carbine person for a long time !

          #9
          Many years ago I worked on a Korean return Garand that shot OK on targets but didn't reliably cycle. Turned out the bore was opening up starting about a half inch from the muzzle, gradually increasing as it went to the muzzle. Basically the as seal was broken early, reducing the gas driving the operating rod. We can argue about what caused it. It could have been erosion from hot gas rushing out of a hot barrel over thousands of rounds. The gunsmith opened the gas hole slightly, and that restored decent function.

          BTW, I have a Special with a new Criterion barrel. It's a tackdriver. Take your rifle to the range and see how it does. Forget about muzzle measurements on a new barrel.
          Last edited by Smokey; 02-08-2019, 06:27 AM.
          The thief may possess something he stole, but he does not own it.
          The owner has a right to take his property back from the thief.

          Comment


            #10
            A note on the Korean returned M1 Garands and muzzle wear. I personally examined over a 1000 of the M1 Garands returned from Korea by Excel, Blue Sky and Arlington Ordnance. Many had wiped out muzzles but low TE measurements. The Koreans had used theses rifles for launching "practice grenades" The repeated launchings eroded the muzzles.

            Comment


              #11
              Originally posted by RDS View Post
              A note on the Korean returned M1 Garands and muzzle wear. I personally examined over a 1000 of the M1 Garands returned from Korea by Excel, Blue Sky and Arlington Ordnance. Many had wiped out muzzles but low TE measurements. The Koreans had used theses rifles for launching "practice grenades" The repeated launchings eroded the muzzles.
              Interesting, never heard that before. Thanks for posting

              Comment


                #12
                Originally posted by RDS View Post
                A note on the Korean returned M1 Garands and muzzle wear. I personally examined over a 1000 of the M1 Garands returned from Korea by Excel, Blue Sky and Arlington Ordnance. Many had wiped out muzzles but low TE measurements. The Koreans had used theses rifles for launching "practice grenades" The repeated launchings eroded the muzzles.
                LOL, not only that but many were virtually smooth bore. A friend of mine had a "Premium" grade Blue Sky he bought many years ago that when you dropped a 30 cal bullet into the muzzle it would rattle through the bore and drop into the receiver. I'm not fooling, it would. Before I got a chance to look at it he complained it wouldn't shoot better than 6-8 MOA with 12 MOA flyers. Geez, I wonder why.🤣🤔

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