GUN Ammo questions

Discussion in 'On Topic' started by THT, Mar 2, 2006.

  1. THT

    THT The easy way is always mined

    Joined:
    Mar 16, 2005
    Messages:
    12,748
    Likes Received:
    0
    Location:
    The booby hatch
    1. What does "grain" refer to?
    2. What does "full metal jacket" mean and why is that important?
    3. What does "+p" refer to?
    4. What does "non-corrosive" refer to?

    Thanks.
     
  2. DaJMan

    DaJMan When i was young, i dreamed of being a baseball

    Joined:
    Nov 7, 2003
    Messages:
    8,004
    Likes Received:
    0
    Location:
    Qld Aus
    hmmm nothing google wont answer...

    but since i feel ur laziness - grain = measurement of weight
    FMJ - lead bullet, coated in usually brass or copper, instead of a hollow point, or soft point (copper jacketed but not covering the top of the bullet)
    +p - not really certain on specifics, but usually more gun power in the bullet (makes it go faster)
    non-corrosive - non-corrosive, doesnt corrode the gun barrel (some rounds can)

    :)
     
  3. itchiban

    itchiban New Member

    Joined:
    Jun 26, 2005
    Messages:
    5,926
    Likes Received:
    0
    Location:
    East Valley
    grains are an actual measurement. more grains, more projectile.

    Full metal jacket projectiles are less likely to deform from the chambering/loading group or barrel than just a lead one. The jacketing also helps keep the "wear" down on the barrel due to its lower friction coefficient

    +p refers to overpressure (higher pressure) +p+ is double overpressure.
    Not all guns can handle the +p/+p+

    Some ammo has corrosive primers. When fired, the deposits (usually sulpher) remain in the barrel, possibly deforming or eating through the metal. You have to do a few extra, immediate steps for cleaning your gun when firing corrosive ammo. Chrome lined barrels help lower the effects of it, but doesn't make the barrel immune.

    I am bored again.
     
  4. krott5333

    krott5333 Guest

    usually grains refers to the size of the bullet, not the amount of projectile.. pressure is not fully determined by amount of powder, but also the burn rate.

    when an ammo says "124gr JHP", that means the bullet weight is 124 grains..

    what a grain is, I have no idea..

    but there are also grains, often called granules, of powder
     
  5. DaJMan

    DaJMan When i was young, i dreamed of being a baseball

    Joined:
    Nov 7, 2003
    Messages:
    8,004
    Likes Received:
    0
    Location:
    Qld Aus
    what he said... :bowdown:
     
  6. DaJMan

    DaJMan When i was young, i dreamed of being a baseball

    Joined:
    Nov 7, 2003
    Messages:
    8,004
    Likes Received:
    0
    Location:
    Qld Aus
    1 grain = 0.06479891 grams

    google.. ;)
     
  7. mrbill

    mrbill New Member

    Joined:
    May 20, 2003
    Messages:
    6,726
    Likes Received:
    0
    Location:
    Cibolo,Tx
    or 1/7000 of a pound. some say it's the equivalent to the weight of 1 grain of wheat, and hence the name.
     
  8. 70Machwon

    70Machwon New Member

    Joined:
    Aug 10, 2004
    Messages:
    10,970
    Likes Received:
    2
    Location:
    Bay area
    7000grains in a pound. On the ammo boxes, it is usually the bullet (200gr for my .35 for example) but is also used for the amount of powder in the round(not usually listed on the box).

    The older suprlus ammo has a certain primer (starts with a "B") that is corrosive to the barrel after fired.


    the rest are thouroughly covered.
     
  9. PanzerAce

    PanzerAce Active Member

    Joined:
    Feb 25, 2006
    Messages:
    14,502
    Likes Received:
    0
    Location:
    N37°18'37" W120°29'50"
    well, since the other stuff is covered, ill just expand a little on the ammo type. Basically, corrosive ammo tends to be the mil-surplus stuff from the 70s and earlier (though I have seen 80s ammo that is corrosive). I personally would only recomend putting corrosive through a gun only if it the most you can afford at the time, and you are willing to INSTANTLY clean the barrel (regular cleaning + warm water to wash out the salts). For instance, on my 2 AR builds, I will NOT be using corrosive, because the uppers are to expensive to risk the chance that I dont clean them fast enough. On the other hand, for the Mosin I am getting over the summer, I am not going to have any qualms about corrosive, because thats what was used in the first place through it, and me cleaning it a few hours late will not do much that the russian military hasnt yet.

    basically: corrosive ammo is for cheap guns, non-corrosive ammo for anything yiou actually care about.
     
  10. 7

    7 First comes smiles, then lies. Last is gunfire.

    Joined:
    Jul 5, 2002
    Messages:
    25,055
    Likes Received:
    0
    grain is a measurement of weight, granule is what you would call one particle of powder. If you want 1.0 grains of powder you'd call it a grain, granule is never used.
     
  11. krott5333

    krott5333 Guest

    oh whoops :o
     
  12. itchiban

    itchiban New Member

    Joined:
    Jun 26, 2005
    Messages:
    5,926
    Likes Received:
    0
    Location:
    East Valley
    Probably thinking of Berdan.
     
  13. 70Machwon

    70Machwon New Member

    Joined:
    Aug 10, 2004
    Messages:
    10,970
    Likes Received:
    2
    Location:
    Bay area
    thats the one.
     
  14. striker754

    striker754 Chillin

    Joined:
    Dec 13, 2001
    Messages:
    16,198
    Likes Received:
    0
    Location:
    Around
    Which is not true. There is new ammo (wolf) that is berdan primed and non corrosive and there is boxer primed ammo that is corrosive

    Style of primer does not tell you if the ammo is corrosive or not.
     
  15. eWRXshun

    eWRXshun hai

    Joined:
    Sep 22, 2003
    Messages:
    16,666
    Likes Received:
    0
    Location:
    LSU
    dot.
     
  16. 70Machwon

    70Machwon New Member

    Joined:
    Aug 10, 2004
    Messages:
    10,970
    Likes Received:
    2
    Location:
    Bay area

    so its the compound of it then. I thiought that Berdan refered to the compound.

    learn something new every day.
     
  17. eWRXshun

    eWRXshun hai

    Joined:
    Sep 22, 2003
    Messages:
    16,666
    Likes Received:
    0
    Location:
    LSU
    the differences between the two primers is how each one gets set off.

    boxer primers have the anvil in the primer and a central flash hole into the casing.

    berdan primers have the anvil in the case and no central flash hole.

    the priming compound is compressed b/w the anvil and the side of the primer that you see when the firing pin strikes it.
     
  18. THT

    THT The easy way is always mined

    Joined:
    Mar 16, 2005
    Messages:
    12,748
    Likes Received:
    0
    Location:
    The booby hatch
    So can an HK USP handle +p or +p+ ammo?

    Thanks for the info everyone!
     
  19. striker754

    striker754 Chillin

    Joined:
    Dec 13, 2001
    Messages:
    16,198
    Likes Received:
    0
    Location:
    Around
    probably
     

Share This Page