Barrel crown

[tenring]

Some shooters re-crown the barrel on a regular basis. How do I determine if/when a muzzle needs to be touched up? Is running a Q tip up and down & across the lands sufficient?

Should a smith do this job, or can a garden variety wanna be do it with this tool:

www.brownells.com/gunsmith-tools-su...apping-tools/45-brass-muzzle-lap-prod679.aspx

 

[jackie schmidt]

Some shooters re-crown the barrel on a regular basis. How do I determine if/when a muzzle needs to be touched up? Is running a Q tip up and down & across the lands sufficient?

Should a smith do this job, or can a garden variety wanna be do it with this tool:

www.brownells.com/gunsmith-tools-su...apping-tools/45-brass-muzzle-lap-prod679.aspx

More crowns are damaged with a cleaning rod than anything else.

I have seen barrels with a distinct trough, (picked up with a indicator) worn into the bottom of the lands and grooves due to allowing that rod to rub against the bottom of the barrel while the shooter is taking those fast, big long strokes while he is cleaning after every group. Learn to stop that rod the instant the brush or the patch cleats the bore. And slow that rod down.

If you damage a crown by hitting something that causes a disruption, that Brownells tool will not fix it. If the wear extends any degree up into the barrel due to bad cleaning habits, it will not fix that.

I'm not sure what it is supposed to fix.

 

[burtona]

Here is the tool bit I use. Final pass is from the bore out for .001-002.
http://www.brownells.com/gunsmith-t...e-bits/barrel-crowning-lathe-bit-prod717.aspx
Dave

 

[JerrySharrett]

Here is the tool bit I use. Final pass is from the bore out for .001-002.
http://www.brownells.com/gunsmith-t...e-bits/barrel-crowning-lathe-bit-prod717.aspxDave

Am I looking at the right tool?

This Brownell tool looks like what most factories use to crown a hunting rifle??

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[JerrySharrett]

Some shooters re-crown the barrel on a regular basis. How do I determine if/when a muzzle needs to be touched up? Is running a Q tip up and down & across the lands sufficient?

Should a smith do this job, or can a garden variety wanna be do it with this tool:

www.brownells.com/gunsmith-tools-su...apping-tools/45-brass-muzzle-lap-prod679.aspx

A brass lap to finish a benchrest barrel crown??

Edit-using a Qtip can detect an excessive burr on a just crowned barrel, IMO.

WHEN to recrown? When the barrel has dropped off its normal performance, or, some shooters who have a lathe simply recrown about every 300-500 rounds.

.IF, a barrel is precisely dialed in on the muzzle GROOVES, a micro bevel can extend or sometimes eliminate recrowning. My definition of a micro bevel is performed with a sharp tool and making a 45 degree bevel slightly past the grooves.


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