Cerrosafe --how to use?

Discussion in 'Gunsmithing' started by OKIE2, Jan 16, 2012.

  1. OKIE2

    OKIE2 Well-Known Member

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    I cleaned the chamber and plugged the throat with 2 patches poured the chamber full then let it cool for 1 hour.
    I could not drive it out ended up heating barrel to melt it out.
    What did I do wrong?
     
  2. MTBULLET

    MTBULLET Well-Known Member

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    not sure, as I've never had this problem. But would think maybe you got the cerro to far into barrel ?
     

  3. OKIE2

    OKIE2 Well-Known Member

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    no I plugged it so the cerrosafe did not go into the neck of chamber.
    only the body and shoulder was filled.
     
  4. MTBULLET

    MTBULLET Well-Known Member

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    heavy rust/pitting in chamber?
     
  5. Aldon

    Aldon Well-Known Member

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    or perhaps rough scratches or machining marks that act as anchor points???
     
  6. Hired Gun

    Hired Gun Well-Known Member

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    I knock mine out at 10 minutes. Cerrosafe shrinks for the first 30 minutes and then begins to grow. At one hour it is supposed to be exact chamber size and at the end of 200 hours it will have expanded approximately .0025".

    From the Cerrosafe instructions.
    The solidified casting should be removed from the chamber before, or when, it cools to room temperature. If allowed to remain in the mold over an hour, it will grip the chamber walls and be difficult to remove.

    If a brass rod won't drive it out I believe you will have to melt it out. Your clock is ticking.

    Oops, just reread your post. Looks like you got it out.
     
  7. OKIE2

    OKIE2 Well-Known Member

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    thank you I will try it again.
     
  8. Trickymissfit

    Trickymissfit Well-Known Member

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    Cerrosafe is nothing more than generic Cerrobend, and was used in industry for years till better stuff came around. It has an extremely low shrinkage factor (way less than .001" per inch of diameter), and is probably much closer to .00025" per inch of diameter. I used to have to pull plugs I made with it to cover bolt holes with a drill and tapped hole and a knocker. It was that tight! I'd be checking the chamber with a bore scope before trying it one more time. I'd almost bet there is a ridge, or the chamber was cut with a banana shape all the way around in the middle of the case body contact. With anykind of taper in the chamber it should be completely free in about 1/8" of movement. Look real close where the body and shoulder meet for a ridge or a groove at the junction. Might try coating the chamber with Johnsons Pledge about three times before pouring the metal. You can decant it from a spray can, and apply it with a cheap artest brush. Pledge is an excellent release agent when working with epoxies.
    gary
     
  9. J E Custom

    J E Custom Well-Known Member

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    Clean the chamber, Plug the barrel with an earplug just past the free bore into the rifling
    about a 1/4 ".

    Then warm the barrel up just a little with a hair drier (warm to the touch not hot).

    Place the barrel vertical and pore the Cerrosafe in the center of the chamber being careful
    not to fill it beyond the top of the barrel (If it is over filed it will hang up on the inside of
    the action).

    In a few minutes, using a bore jag smaller than the cleaning rod, tap the Cerrosafe casting
    out of the chamber, (Be sure to use a rod guide that goes in the muzzle to prevent any damage
    to the crown). place the back end of the action on a piece of carpet to keep from damaging
    the casting of your chamber.

    You should not have any problems unless there is something very wrong with the chamber.

    J E CUSTOM
     
  10. OKIE2

    OKIE2 Well-Known Member

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    I got it done only let it cool for 15 minutes and it came right out
    thanks guys.
     
  11. Anderson0

    Anderson0 Member

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    Hi dear am newbie here and i want to say that i also want to know that how to use it and if you get any suggestion about it this than kindly also contact me i really need some suggestions .
     
  12. shortgrass

    shortgrass Well-Known Member

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    Follow the instructions in JE Customs' post. The only thing I do differently is use a patch instead of an ear plug to plug the bore. I, also, very lightly oil the chamber using a light oil, like wd-40 or Kroil,,, very lightly!