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Thread: M1881 38-55 screw

  1. #1
    Boolit Buddy DrDucati's Avatar
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    M1881 38-55 screw

    I loaded up some 38-55 BP rounds and shot em in my Marlin for the first time. Action is smooth and seems to hit where I aim, though I wasn't set up to really check accuracy.

    I'm cleaning it and taking it down at which point two things happened

    1) my heart sank when I saw a ring about midway down the bore. How bad is that supposed to affect accuracy?

    2) The dust cover screw came out alright, couldn't get it back in; in fact it turned to mush and the head came apart. I'm using appropriate hollow ground tools. I suspect it was some sort of replacement. So I wonder if anyone here who owns an M1881 can check theirs and measure the screw for thread and pitch diameter for me? Then I can buy or fashion a replacement. I believe I will need to retap the hole for that also.

  2. #2
    Boolit Grand Master

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    How bad is the ring and is it a ring or just a dark spot? I have seen barrels with rings/ bulges that shot good still, and others that were ruined. A lot depends on how heavy big they are and location of them in the barrel. A good look in it with a bore scope may tell a lot.

    Check gun parts corp West Hurley New York. Their schematics and parts lists may give screw size, or they may have one on hand.

  3. #3
    Boolit Buddy DrDucati's Avatar
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    Thanks gent. as often as I get old guns probably worth getting a bore scope. It's a thin ring that a can feel when I run a jag through the bore but not sure how deep it is.

  4. #4
    Boolit Master
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    Had an instructor at CST that had a .22 whose barrel had 4 very noticeable bulges along it's length, one was only about 2 inches from the muzzle. He said it still shot very good groups. A bulge does not automatically mean a barrel is no good.
    Spell check doesn't work in Chrome, so if something is spelled wrong, it's just a typo that I missed.

  5. #5
    Boolit Buddy DrDucati's Avatar
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    Quote Originally Posted by ulav8r View Post
    Had an instructor at CST that had a .22 whose barrel had 4 very noticeable bulges along it's length, one was only about 2 inches from the muzzle. He said it still shot very good groups. A bulge does not automatically mean a barrel is no good.
    Mine has no bulge. It's an annulus-shaped pit, but I understand your point.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check