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Where does the air go?

daddodaddo Member Posts: 3,408
edited March 2002 in Ask the Experts
Last night I was reloading some 22-250 ammo and had a thought. When the bullet is pressed into the brass, what happens to the air the bullet displaces? Is it compressed or does it leak out of the sides from the mini-scratches in the brass? When ambient air is compressed- the moisture in the air will condense some. Does the air help the burning of the powder?
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Comments

  • daddodaddo Member Posts: 3,408
    edited November -1
    I know it sounds like a dumb question but I quess I just like to know.
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  • Tailgunner1954Tailgunner1954 Member Posts: 7,734 ✭✭
    edited November -1
    Well the bullet is a press fit into the case, and in the case of a cast slug their is often a lubricant that will act as a secondary seal.In my opinion what little air that is in there is compressed, (and for most of the loading I do so is my powder)
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  • spclarkspclark Member Posts: 408 ✭
    edited November -1
    Thoughts get to wandering when you're seating bullets, eh?I try to get into a Zen mindset myself, "seeing" the bullets into a tight little group, right at the X on my targets....I've wondered about the same thing though, in passing. Air's not compressed much I imagine, from the relative volumes involved,and the brass probably expands ever so slightly as well (got a micthat'll measure to .00005?), and nitrocellulose does absorb watervapor slightly, so I doubt it has as much effect as a + or - .05 grainvariation of your preferred propellant.
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  • Tailgunner1954Tailgunner1954 Member Posts: 7,734 ✭✭
    edited November -1
    Speaking of Zen and targets, My wife thinks I'm weird that I point each and every bullet at a deer picture and than polish them with a piece of buck fur/hideHelp me convince her that I'm normal.
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  • dheffleydheffley Member Posts: 25,000 ✭
    edited November -1
    Though the bullet and the primer are pressed, they are not an air tight seal. The case will pressure up to a degree, but in a few minutes, the over pressured air leaks out. The same reason that moisture can leak in.
    Save, research, then buy the best.Join the NRA, NOW!Teach them young, teach them safe, teach them forever, but most of all, teach them to VOTE!
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  • shootlowshootlow Member Posts: 5,425
    edited November -1
    TAILGUNNER there is not a thing wrong with you. tell MRS GUNNER we took a poll and you are normal people
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  • gruntledgruntled Member Posts: 8,218 ✭✭
    edited November -1
    Gaseous diffusion. The molecules of air pass between the molecules of rubber. The air pressure & thickness of the rubber will affect the rate. Think how quickly a balloon deflates & a balloon filled with helium will deflate even faster since the molecules are even smaller.
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  • XracerXracer Member Posts: 1,990 ✭
    edited November -1
    Actually the air is compressed and goes into another dimension along with the air from bicycle tires, ballons, missing socks from dryers, other shoes (that AREN'T found on the sides of highways), Judge Crater, Amelia Earhart, and Jimmy Hoffa.(unless njretcop finds Hoffa's body in the Meadowlands while he's hunting)
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  • daddodaddo Member Posts: 3,408
    edited November -1
    Thanks, xracer- that i can relate to. It all makes sense now. A fast dryer will send the socks into a time/space continuim much like a black hole, thus ending up in another drier far away traveling at the same speed. Thats why I find socks I don't own. I'd better get a doctor to look at me.
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  • laxcoachlaxcoach Member Posts: 1,296 ✭✭✭✭✭
    edited November -1
    Daddo---"socks I don't own"--hope you haven't found any strange underwear in your dryer !
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  • skipjackoneskipjackone Member Posts: 208 ✭✭✭
    edited November -1
    Xracer, just found J.Hoffa in my dryer. Now for the weird part. He had on Amelia's socks.
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