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Old March 16, 1999, 09:25 AM   #1
Axel Yup
Join Date: November 7, 1998
Location: Sparks, MD, USA
Posts: 42
I am looking to have some work done to a S&W J-frame. Teddy Jacobson offers an option called "recut crown 45 degrees and polish bore."

What does this work entail and how does it help?

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Old March 16, 1999, 11:43 AM   #2
Tom B
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Join Date: February 16, 1999
Location: GA
Posts: 1,836
The crown is at the exit end of the barrel and protects the rifling from any dents or damage so that the exiting bullet leaves the barrel true. Recrowning is just redoing the crown with a more "true cut" than comes from the factory and this is supposed to increase accuracy.
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Old March 16, 1999, 04:05 PM   #3
Axel Yup
Join Date: November 7, 1998
Location: Sparks, MD, USA
Posts: 42
Tom B,

Thanks for the info. When the crown is "recut 45 degrees," what does this angle refer to?

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Old March 16, 1999, 04:28 PM   #4
Michael Carlin
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Join Date: October 13, 1998
Location: Fredericksburg, VA USA
Posts: 193
The centerline of the bore 45 degrees would be half way between parallel and a right angle. 45 is an odd angle for a crown, usually the figure I see for competition rifles in 11 degrees, which I presume to actually be 79 degrees. Confusing, isn't it.

To me you cut the barrel off at 90 degrees, so the correct figure should be 11 degress short of that, or 79 degrees. A 45 degree crown is very radical IMHO.

Ni ellegimit carborundum esse!

Yours In Marksmanship


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Old March 16, 1999, 09:05 PM   #5
Daniel Watters
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Join Date: February 7, 1999
Location: USA
Posts: 644
Michael, the 45 degree crown is actually quite common for field/service grade firearms. It helps insure that the end of the bore is protected from nicks and dings of daily service. True, it is not the best choice for a benchrest rifle, but a J-frame S&W doesn't require that level of accuracy either.
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Old March 18, 1999, 02:37 PM   #6
Walt Welch
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Join Date: November 3, 1998
Location: Alamo, CA
Posts: 424
Axel; be sure and have the smith recut the forcing cone; this is often very rough in J frames in particular, and your revolver will benefit from a more gradual angle on the forcing cone, as well as smoothing it.

Be very careful that the smith doesn't lighten up the rebound slide spring and main spring too much; you will get a better trigger pull, but the one I had became unreliable and would misfire on occasion.

Hope this helps, Walt
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