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Thread: 2 Random Questions

  1. #11
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    the Otis kit is great for taking to the range and I use it for my M&P9 barrel
    Its a nice portable backup. I keep it in my rifle case.
    I dont use it for my bolt gun unless it needs cleaned at the range.
    Last edited by saddlerocker; 07-28-11 at 20:32.

  2. #12
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    Quote Originally Posted by Animal_Mother556 View Post
    It is my understanding that brass coming from a semi-auto is always hotter. The reason the brass even gets hot is not from the powder burn (that does make it warm, however). The heat is from the friction of being ripped from the chamber during extraction.

    Once the round is fired, the brass is swelled slightly to take the shape of the chamber (which is why reloading involves "re-sizing" the brass). So, the brass is now very tight against the chamber walls, and then it gets ripped out with great speed during extraction.

    Same reason that your barrel gets hot. It's from the friction of the bullet traveling through it at 3,000 FPS.
    nah, not true. the brass does expand to fill the chamber but it also shrinks back when the pressure drops. not all the way but enough to be pulled from the chamber easily.

    when reloading cases for accuracy in a bolt action match chamber, I don't resize the cases at all, only the necks. all case shot in an auto loader get full length resized...
    never push a wrench...

  3. #13
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    Quote Originally Posted by ra2bach View Post
    nah, not true. the brass does expand to fill the chamber but it also shrinks back when the pressure drops. not all the way but enough to be pulled from the chamber easily.

    when reloading cases for accuracy in a bolt action match chamber, I don't resize the cases at all, only the necks. all case shot in an auto loader get full length resized...
    Well, damn it. Now I'm hungry for some proof. Anyone know of any "test" that someone has done?
    -

    Evey -- Are you like a...crazy person?
    V -- I'm quite sure they will say so.


    "Two things are infinite: the universe and human stupidity. And, I'm not sure about the universe" -- Einstein

  4. #14
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    Quote Originally Posted by Animal_Mother556 View Post
    Well, damn it. Now I'm hungry for some proof. Anyone know of any "test" that someone has done?
    test it yourself. just pick up the empty that has just been ejected and slip it back into the chamber...

    or, shoot a brass case cartridge in your rifle with the extractor removed. lock the bolt back, then slip the empty case out with the tip of something pointy (I use the corkscrew on my multitool) or just push it out with a rod down the barrel from the muzzle.

    don't try this with steel case ammo though, it's not the same...
    Last edited by ra2bach; 07-29-11 at 17:26.
    never push a wrench...

  5. #15
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    I was talking more about the temperature of the brass, and why it's hotter from Semi-Autos
    -

    Evey -- Are you like a...crazy person?
    V -- I'm quite sure they will say so.


    "Two things are infinite: the universe and human stupidity. And, I'm not sure about the universe" -- Einstein

  6. #16
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    Quote Originally Posted by Animal_Mother556 View Post
    I was talking more about the temperature of the brass, and why it's hotter from Semi-Autos
    BRB (be right back)...

    edit: found it! http://www.ar15barrels.com/prod/operation.shtml

    thought it would be more specific in regards to the case springing back close to its original diameter but rest assured, it does. otherwise you would be ripping the heads or rims off the cases, not extracting them...
    Last edited by ra2bach; 07-29-11 at 18:17.
    never push a wrench...

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