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Thread: Kaboom from high round count?

  1. #21
    Boolit Grand Master

    Lloyd Smale's Avatar
    Join Date
    Mar 2005
    munising Michigan
    ya I would think after 50k the rifling was all but gone and if anything pressure would have dropped because of it. About like shooting a 401 bullet out of your 41 mag. Either it was fatiqued metal or a bore obstruction. Keep in mind that guns are proofed at over double operating pressures so I doubt unless the guy was mistaking pistol powder for rifle powder youd get enough of an overload to do that. Using most powders that are handload in a 308 there isn't enough case space left to double the pressure. Might get a sticky or stuck bolt or a pierced primer but to actually rip a barrel open your talking LOTS of pressure.
    Soldier of God, sixgun junky, Retired electrical lineman. My office was a 100 feet in the air, closer to God the better

  2. #22
    Boolit Buddy
    Join Date
    Mar 2010
    NC Arkansas
    Unless that gun has had a professional re-finish lately, it has seen 50,000 rounds like I can run 50 mph. Idiots come up with some mighty tall tales to hide their stupidity.

  3. #23
    Boolit Buddy
    Join Date
    Jul 2015
    I agree that obstruction is most likely.

    Low cycle fatigue is completely out of he question, it only occurs with repeated yielding.

    High cycle fatigue starts with cracks that propagate slowly at first. The image of the torn surface of the barrel where it separated show over-stress yielding, not fatigue.

    The over-stress tearing of the barrel without any signs of pressure at the case head do not fit anything other than obstruction.

  4. #24
    Boolit Master

    Join Date
    Dec 2008
    Kingsport TN
    I'm with Mr. Gibson on this one! Add to that the case head shown can't be the one that burst that barrel! I've seen more blown up guns than I want to see and in EVERY instance the case head is destroyed without exception.

  5. #25
    Moderator Emeritus / Trusted loob groove dealer

    waksupi's Avatar
    Join Date
    Mar 2005
    Somers, Montana, a quaint little drinking village,with a severe hunting and fishing problem.
    I think it more likely caused by bore obstruction, or a secondary explosive effect (SEE) from a small charge of slow powder.
    The solid soft lead bullet is undoubtably the best and most satisfactory expanding bullet that has ever been designed. It invariably mushrooms perfectly, and never breaks up. With the metal base that is essential for velocities of 2000 f.s. and upwards to protect the naked base, these metal-based soft lead bullets are splendid.
    John Taylor - "African Rifles and Cartridges"

    Forget everything you know about loading jacketed bullets. This is a whole new ball game!

  6. #26
    Boolit Buddy

    Join Date
    Aug 2010
    Alexandria VA
    Quote Originally Posted by M-Tecs View Post
    "Most likely this rifle has seen somewhere in between of 50 000 and 80 000 bangs without any serious issues like this, and anything has its limits of wear and tear." 50k to 80k through a lightweight Model 70 308???????????????? I am more than a little skeptical of the round count. I am in the bore obstruction camp.
    50,000 to 80,000 rounds...I didn't know there was a full auto conversion for that model...

  7. #27
    Boolit Master starnbar's Avatar
    Join Date
    Sep 2009
    central florida
    Not an expert on metallurgy but in my 45 years of shooting i have seen a few burst barrels and most of them were bore obstructions a few over loads that looks like a bore obstruction.

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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