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CROWNING ?

chill44
What does it mean, to recrown a barrel after it has been cut?
Is this the radius at the end of the barrel?
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7 comments

Date Votes
  • Salvage33
    Crowning a barrel after it has been cut is to make certain that the end of the barrel is 90 degrees to the bore, free from all burred metal and symmetrical. There are various types of crowning, most being of a rounded or oval symmetry from the outer edge of the barrel to the bore. Another type is recessed. This is done by machining the fresh cut end to 90 degrees to the bore, then recessing that into the bore. Only a very competent gunsmith/machinist with the proper equipment, skill, and knowledge should crown a barrel.

    IF you have shortened a barrel and every thing at the business end of it is not right, accuracy will be severely hampered. It might also lead to "keyholing" your bullets as they impact the target...in other words, your bullets don't "fly" but rather tumble in flight.

    John


    A penny saved is a congressional oversight!
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  • JustC
    The Crown is important in that it determines the angle at which the escaping gassess will be directed, but that in turn determines the stabilization, or lack thereof, of the bullet as it exits the bore and enters the environment. Crowns that are NOT 100% square with the bore and polished and/or having "knicks" on the rifling edges at the muzzle surface, will cause less stabilization of the projectile and that effect will grow greatly over distance travelled. This surface must be protected with as much care as the scope lenses[8]

    steptargetcrown.jpg

    why chase the game when the bullet can get em from here?....
    Got Balistics?
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  • mrbruce
    The crown is the radius cut into the end of a barrel. You can usually tell if a crown is correct for the gun by closely looking at the edges of it after firing it a few times. If the burnt powder is leaving a nice concentric star burst ring all the way around the periphery of the bore you got a good one, and it was cut the correct way. This would be especially noticable on a 22rf barrel.

    Gun control is hitting what your aiming at.
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  • chill44
    Thanks for the reply. I think I can handle that. I'm a Machinist by trade, and try to do all the smithing I can my self. But, some things scare me. If I don't know, I will ask!![8D]
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  • FrancF
    Ok, Guys I need a refresher. The 11 degree barrel crown? Is that the type put on pencil barrel's or old style crowning? I have the 11 degree's stuck in my head.




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    NRA Life Endowment Member
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  • JustC
    there are radiused crowns, flat crowns, and angled crowns (the 2 latter usually being recessed). I beleive that the 11degree to 13degree is the target crown many smiths use. The radiused crown is like you would see on a factory rem70 or win70. Flat is most always a benchrest gun.

    why chase the game when the bullet can get em from here?....
    Got Balistics?
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  • FrancF
    Thats it Thanks justin.




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    NRA Life Endowment Member
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