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crown

 
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  #8  
Old 03-04-2010, 09:43 AM
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Join Date: Jul 2007
Posts: 935
Re: crown

Quote:
Originally Posted by topbrass View Post
An 11 degree crown is recessed.
the 11 deg. target crown is not recessed, per sey, only the slight depression caused by the 11 deg. shape.
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  #9  
Old 03-04-2010, 12:17 PM
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Join Date: Feb 2010
Posts: 192
Re: crown

Quote:
Originally Posted by MTBULLET View Post
the 11 deg. target crown is not recessed, per sey, only the slight depression caused by the 11 deg. shape.
It is recessed per se. It is just not a stepped down 90 deg. crown. The 11 deg. crown is easier to maintain and affords plenty of protection. Generally it will be as deep as a 90 degree stepped crown, it just doesnt look that way.
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  #10  
Old 03-04-2010, 10:47 PM
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Join Date: Dec 2009
Posts: 71
Re: crown

With all the different guns I had built I wanted and love the 11 degree crown concentric to the bore within .0002" with a 60 degree chamfer has worked get on all of my toys.
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  #11  
Old 03-07-2010, 10:04 PM
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Join Date: Aug 2009
Location: Carlisle, PA
Posts: 478
Re: crown

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Originally Posted by dud View Post
what kind of crown would you put on a 2506ai,10 twist,27 inch barrel?gun will be mostly used off bench for 100 gr and under bullets under 500 yd shots at groundhogs.does it matter
One of these:



What is important about the crown is to have the plane of the crown at the muzzle perfectly orthogonal to the bore centerline at the muzzle, and have the edge of the exit hole perfectly symmetrical. For me that is easiest to do with a recessed target crown like this one. Crisp square edge, no bevel is easiest way for me to make sure all is symmetrical.

The only reason for the recess it to provide some measure of protection from damage. Other than that if it was a perfectly flat crown it would work fine.

The 11 degree crowns with a crisp edge work as well, they are just harder to make, so I do it this way.

Fitch

Fitch
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  #12  
Old 03-07-2010, 10:31 PM
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Join Date: Feb 2010
Posts: 192
Re: crown

Do you break the thin edge of the bore to keep it from burning off unevenly?
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  #13  
Old 03-08-2010, 05:59 AM
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Join Date: Aug 2009
Location: Carlisle, PA
Posts: 478
Re: crown

Quote:
Originally Posted by topbrass View Post
Do you break the thin edge of the bore to keep it from burning off unevenly?
No, I don't. I cut it with a very sharp freshly honed HSS tool and oil. I leave it as cut. The edge is square and quite sharp. If the new camera adaptor I made for the borescope yesterday works as well as I hope it does, I'll see if I can post a picture of a this same crown a year, 500 rounds, and a number of cleanings later.

After a bronze brush has been run over the new crown it burnishes up sharp and square. It will stay that way unless abused.

Fitch
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