Bullet set back reminder

This is a discussion on Bullet set back reminder within the Concealed Carry Issues & Discussions forums, part of the Defensive Carry Discussions category; Originally Posted by sheeplenot How much set back is to much. At what measurement should you shoot up your bullets and at what point should ...

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Thread: Bullet set back reminder

  1. #31
    Member Array ken45's Avatar
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    Quote Originally Posted by sheeplenot View Post
    How much set back is to much. At what measurement should you shoot up your bullets and at what point should you discard them to the dumpster. Right now I have some .40 s&w HST's that are .006 of an inch shorter then new should I keep them in rotation or shoot them up?
    I think if we had a real measurement to watch for it would help.
    I believe that 40SW is one of the most risky rounds with setback because the case is small and the pressure is high. A few hundreths of an inch can double the pressure (from 35K to 70k). It's expecially a problem, I believe, with 180grn bullets which sit deeper in the case to start with.

    There is a good discussion of this issue at
    The Gun Zone -- Glock Model 22 kB!

    (The issue is NOT limited to Glocks, although it is seen more frequently with Glocks than with other brands.)

    There are also comments and warnings from Glock and Sig about the dangers of rechambering rounds, as well as from ammo manufacturers in other discussions on the site.

    "I found that the duty ammo took quite a beating in 6 months. Also just about every ammo manufacturer will tell you that the ammo is only rated for two (2) times through a semi-auto pistol (chambering/extracting), and both Winchester and Federal as recently as two months ago confirmed this again. After two times bullet set-back could start."

    Somewhere on The Gun Zone there is a chart with actual setback vs. pressure, but I can't find it at the moment.

    Ken

  2. #32
    Member Array RobbW's Avatar
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    Rocky, I didn't realize set back rounds could cause unsafe pressures. Not being a reloader, I never learned that. Thanks for the important info. I had been using multi-chambered rounds as practice ammo.

    Quote Originally Posted by Mainspring View Post
    Every time I take a round out of the chamber I empty the mag, keeping the rounds in order, and put the one from the chamber at the back of the line.

    YMMV

    Mainspring, I do the same thing. Glad to know I'm not the only one--sometimes I feel a bit too careful (compulsive about it).

  3. #33
    Senior Member Array Pete Zaria's Avatar
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    Sorry to kick up an old thread, but...

    I was just messing around with my new .45 a bit. I re-chambered the same round 10 times, and checked it with calipers afterwards - sure enough, down to 1.234" from 1.260.
    Now, with standard-pressure ammo, I doubt that the slightly reduced case volume would produce high enough pressure to cause a failure - but I won't be shooting that round, that's for sure.

    Peace,
    Pete Zaria.
    Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has.
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    "Booger Hook Off the Bang Switch" - unknown

  4. #34
    Member Array ken45's Avatar
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    Quote Originally Posted by Pete Zaria View Post
    Sorry to kick up an old thread, but...

    I was just messing around with my new .45 a bit. I re-chambered the same round 10 times, and checked it with calipers afterwards - sure enough, down to 1.234" from 1.260.
    Now, with standard-pressure ammo, I doubt that the slightly reduced case volume would produce high enough pressure to cause a failure - but I won't be shooting that round, that's for sure.

    Peace,
    Pete Zaria.
    Pete, good testing and thanks for sharing.

    In a .45 which is low pressure (17K IIRC), the risk is a lot less than in a high pressure, "at the limits" round like 40SW. That kind of setback on a 40SW round would be really scary.

    The setback you measured on the .45 probably is well within the limits for a +P round (that's just a guess, not a recommendation). But there is no +P for 40SW.

    Ken

  5. #35
    VIP Member Array Thumper's Avatar
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    The other evening I checked my carry ammo... sure enough, some of the rounds are seated a little bit deeper in the case from being cycled several times.

    Time to rotate that batch out to range ammo!
    ALWAYS carry! - NEVER tell!

    "A superior Operator is best defined as someone who uses his superior
    judgement to keep himself out of situations that would require a display of his
    superior skills."

  6. #36
    Lead Moderator Array Tangle's Avatar
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    Quote Originally Posted by Danger Mouse View Post
    I avoid this by loading the mag to capacity, then drop one in the tube, then release the slide. Never have any problems doing it this way
    DM,
    There was a thorough discussion of this loading method here:

    http://www.defensivecarry.com/vbulle...pdate-3-a.html

    We found that some manufacturers are ok with this, others do not recommend it. I think the manufacturers that are OK with the method is on the last page of the thread.
    I'm too young to be this old!
    Getting old isn't good for you!

  7. #37
    VIP Member Array edr9x23super's Avatar
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    +1 on mainsprings' post. I do exactly that, and make it a point to shoot the rounds and replace them with fresh loads every 6 months. The old rounds I usually run through a stage in an IDPA match just so I get some realistic practice with defense loads.

    To me, it is just the cost of doin' bidness, as we say here in Texas.....
    "Guard with jealous attention the public liberty. Suspect everyone who approaches that jewel. Unfortunately, nothing will preserve it but downright force. Whenever you give up that force, you are inevitably ruined". - Patrick Henry

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