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Thread: Bren Semi-auto bullet set-back

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  1. #1
    Member jeff_b's Avatar
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    Bren Semi-auto bullet set-back

    Any guess on what might be the cause of bullet set-back on my old Bren LMG? It happens with all different ammo types. See photos (if I attached them correctly!).




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    Really Senior Member Brit plumber's Avatar
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    When you say all bullet types, does that include FMJ? Does it include standard service ball? Different mags? Is it a rewat/reweld?

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    Really Senior Member Mr E's Avatar
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    They were not made to use soft point bullets.
    Check your feed ramps and also check the feed lips on your magazine.
    With a FMJ the tip should line up with the groove in the feed ramp and be slighty lower
    1ATSR 177AD & 4/3 RNSWR

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    Senior Member MGMike's Avatar
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    Clearly the round is stubbing while trying to feed. Are you positive that the mag is correctly loaded (i.e., each cartridge rim ahead of the one below)?

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    I'd be helpful to know what it is stubbing against. Looking at the bullet end on might give us a clue

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    Really Senior Member Paul S.'s Avatar
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    Are these reloaded rounds, and if so, have they been properly crimped? What is causing the stubbing really is the big question - and is the most likely cause.

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    Really Senior Member Bruce_in_Oz's Avatar
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    Soft-pointed bullets: first problem.

    That said, we need to know exactly where the soft tip is striking.

    If you must reload, you need to use a recipe that closely matches the:

    Overall cartridge length,

    projectile profile,

    projectile WEIGHT

    and muzzle velocity

    of the good-old Mk7 ball ammo around which these .303 cal guns were built.

    Does this happen with ALL mags or just one / a couple?

    Check your magazine "filling' technique and the mag springs.

    If it is a "re-weld", check the guide surfaces leading from the mag to the chamber.

    Was it once one of the Canadian-made Brens in 7.92 x 57? If so, it will likely have different cartridge feed behaviour from a "native" .303 gun.

    I haven't touched a Bren for a few years, so others should chip in with additions / corrections to my little list.
    Last edited by Bruce_in_Oz; 10-28-2018 at 04:17 AM.

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    Really Senior Member Brit plumber's Avatar
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    I don’t think we’ll hear from the OP again, he last logged on the day after his post having had a number of replies and not responding further.

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    Advisory Panel browningautorifle's Avatar
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    Quote Originally Posted by Brit plumber View Post
    I don’t think we’ll hear from the OP again
    Typical...
    Regards, Jim

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    The Bren forum is notorious for such, er......., naughtiness!

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