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Recrown Barrel / Brownells Chamfering Cutter?

 
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  #1  
Old 08-06-2014, 02:29 AM
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Join Date: Feb 2014
Location: Athens, GA
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Recrown Barrel / Brownells Chamfering Cutter?

Hello long range hunters!

I need some advice about the crown on my new rifle and would welcome any input you may wish to offer.

To make a short story long...

This is a Browning BAR Longtrac in 300 Win Mag that I got a few months ago. The gun has had less than 50 rounds fired through it - just enough to break it in, sight in the scope, and go on a quick hog hunt. When I gave it it's first good cleaning, I noticed that there is a small nick right on the edge of the crown which you can see in the photo below. (Please ignore all the lint.) Anyway, I haven't had time to do anything about this since I put the gun away after its maiden voyage, and now it's time to start thinking about the upcoming season... So, would you rework the crown on this barrel?





If so, what are your thoughts on using a Brownells 45 degree chamfering cutter to chamfer the edge of the bore just enough to take out the nick? The cutter has a caliber specific brass pilot to maintain concentricity to the bore and looks like it should do the job without having to send the gun to a gunsmith for a spin on the lathe.





Has anyone used one of these? What was your experience? Is this a good DIY solution, or is it likely to do more harm than good?

I appreciate any input and thanks in advance!
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  #2  
Old 08-06-2014, 09:31 AM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

How does it shoot now? At a recent gunsmithing course, the instructor was talking about a study written up by another gunsmith in which he intentionally damaged the crowns. He started with small nicks in minor locations and continued to major gouges. In the end, his conclusion was it doesn't matter unless you see accuracy drop off; no specific damage produced an expected drop off in accuraccy. I'd keep hunting until it has enough damage to show on paper, then look at doing something about it. If you do decide to recrown, I would recommend against a single angle on the crown. I like to have a transition angle of a few thousandths thickness from the lands and grooves to the actual crown.
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Old 08-06-2014, 09:37 AM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

As was said. If it shoots, IMO don't mess with it.

But if it don't...

I would get the Manson kit (well, I did) or have a GS clean it up.
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  #4  
Old 08-06-2014, 10:36 PM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

Quote:
Originally Posted by jfseaman View Post

+1

I would get the Manson kit (well, I did) or have a GS clean it up.
The hand crowing tools , If used properly/carefully will do a decent job. but in my opinion, the "Best way is with a Lathe and I recommend the 11o crown.

The short pilot crowning tools like the Brownells can chatter and are not as precise aslonger piloted tools.

Just my opinion

J E CUSTOM
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Old 08-06-2014, 11:41 PM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

Practice practice practice.
Quote:
Originally Posted by J E Custom View Post
The hand crowing tools , If used properly/carefully will do a decent job. but in my opinion, the "Best way is with a Lathe and I recommend the 11o crown.

The short pilot crowning tools like the Brownells can chatter and are not as precise aslonger piloted tools.

Just my opinion

J E CUSTOM
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  #6  
Old 08-06-2014, 11:56 PM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

Always thought this test was interesting... The Over-Rated Crown
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Old 08-07-2014, 05:51 AM
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Re: Recrown Barrel / Brownells Chamfering Cutter?

Quote:
Originally Posted by Barrelnut View Post
Always thought this test was interesting... The Over-Rated Crown
I agree ... and really like the one sentence conclusion.
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