I'm considering Polishing the Inside kneck of my 7mm brass.

Discussion in 'Reloading' started by Tall, Jun 25, 2013.

  1. Tall

    Tall Well-Known Member

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    Has any body ever tried polishing the inside neck of there brass? I am considering using some brass polish compound and spin something on the inside of the brass to create a smooth polished surface. Does any body know how this might effect the accuracy and other performance of a load?

    I tumble all my brass and add polishing compound but the inside doesn't seem to look all that shiny and smooth. It would seem to me that having a polished and smooth surface for the bullet to exit from would help the bullet to exit more smother and be more accurate.
     
  2. MudRunner2005

    MudRunner2005 Well-Known Member

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    I would naturally assume it would be smoother for the bullet to let go, but then again, some bullets need to have that neck-tension to build up the proper pressures to gain the velocity you desire.

    So, I think it could be a gain, or be a loss, and might be a coin flip to see which one it was....Never heard of anyone doing it before.
     

  3. Rbreb13

    Rbreb13 Member

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    I don't think I would bother with it. Seems like a lot of work for little or no gain. I've never heard of anybody doing it. So it's likely it's not worth it.
    Over thinking a non-existent problem.
     
  4. rick523

    rick523 Well-Known Member

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    You would be better off using an ultra sonic cleaner. Clean shinny brass without all the wasted effort. JMOlightbulb
     
  5. Tall

    Tall Well-Known Member

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    I acutally bought one but then took it back because allot of people said even thought they use it they still put there brass thought the media tumbling.

    Maybe when I have some extra money again I will go buy one again.
     
  6. MudRunner2005

    MudRunner2005 Well-Known Member

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    Oh yeah, you still have to tumble them to get them shiny and bright and clean.

    I use the Hornady L-n-L Magnum Sonic Cleaner and their sonic solution. Cleans them up really nicely when you run them for 1.5 hours at around 135*, however, you will still have to let them dry overnight, or put them in the oven on low heat to dry them out, then tumble them the next day. I always let mine dry overnight. Then I run them for about 10-12 hours in the tumbler, while I'm at work, so nobody gets agitated by the noise of the tumbler running full of brass. :D 12 hours tends to get my brass cleaner and shinier than they were new and gets ALOT of the caked-on powder residue and stuff knocked off the walls on the inside.
     
  7. Tall

    Tall Well-Known Member

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    Couldn't you just dry them off with a towel and then toss them in the media? The media would pull any moisture out anyway. I usually wash them off after putting them through the media because I don't like all the dust on them. I like to make sure there isn't any tiny media stuck on the inside. I usully get a few in the sink after washing them out. Then I dry them off on a towel and blow through them to push excess water out, then set them in a case holder to air dry for a few days before I prime them.
     
  8. MudRunner2005

    MudRunner2005 Well-Known Member

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    No, b/c the insides are also wet. The wetness will cause the media to stick to the insides of the brass and it won't move around to clean it it will just stick to the sides of it and cake up.

    The brass has to be thoroughly dry before putting it in the tumbler.
     
  9. SidecarFlip

    SidecarFlip Well-Known Member

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    To put it more graphically, think of a cat turd in a litter box and what happens to the kitty litter close to the turd................:D
     
  10. MudRunner2005

    MudRunner2005 Well-Known Member

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    Even better visual.... :)
     
  11. SidecarFlip

    SidecarFlip Well-Known Member

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    In as much as my wife is a cat lover (I'm not but I do enjoy home cooked meals and clean sheets and sleeping in the garage isn't an option) we don't have 'Fresh' cat litter around here very long.

    Was real thoughtful of my wife to put the mega litter box next to my personal bathroom.

    I can't put down my real opinion of cats on here because my wife might read it so I have to be nice.
     
  12. MudRunner2005

    MudRunner2005 Well-Known Member

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    Yeah, I'm a large-breed dog guy.....Can't stand cats or dogs the size of cats that bark at everything agressively, yet they cowar in fear and start shaking when you stomp your foot at them.
     
  13. Mikecr

    Mikecr Well-Known Member

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    This is a bad move. Polishing the inside of your necks will only serve to increase seating forces, which will lead to increased seating depth variance, and this can hurt accuracy.

    Are you entering your brass in a 'shiny insides contest'?

    NOPE. Won't change a thing there.

    You can shoot as well as top competitors with a quick brush through necks & a swipe of primer pockets & a cycle through vibratory media -just like they do(if that much).
    That thin carbon film in there? It's your friend. It reduces friction and very consistently normalizes seating forces.
     
  14. SidecarFlip

    SidecarFlip Well-Known Member

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    If you use wet media like STI in a rotary tumbler, the inside gets as clean as the outside. I just happen to use stainless steel balls myself. I dry my brass in the wife's dehydrator. Takes about 30 minutes.

    I always start out with cob in a vibrator prior to anything to get the crap off because I'm addicted to Federal OFMB and those military cases are always filthy.

    Iv'e heard good and bad about ultrasonic cleaning. I might 'borrow' my wife's jewelery cleaner for a test run with Lemshine and liquid dish detergent.