looking into the crown - end of barrel

[robbiebobbie]

Does anyone have any tricks they use to look at detail of the bore at the crown of the barrel? Looking for chatter, burrs etc...

[Jayhad]

Borescope

[fish_e_o]

why would you need to look at it so closely?

[obsessed1]

Edit

[fps plus]

Use a loupe or magnifying glass slip a piece of white tissue carefully into the muzzle in approx 1/4 inch and shine a light in and look with magnifier

[spurly]

Turn your binoculars, upside down, and look through the objective end. They magnify, quite well if you can hold them steady enough.

[calgarychef]

Your iPhone has a built in magnifier with light if you wish

[fps plus]

Originally Posted by calgarychef

Your iPhone has a built in magnifier with light if you wish

Cool , where do you find it? Are you talking about the camera mode?

[fps plus]

Found how to enable magnifier on my phone thx

[robbiebobbie]

Thanks, the tissue reflects the light well. I tried a Q-tip & reflects the light well also .

[robbiebobbie]

Originally Posted by fish_e_o

why would you need to look at it so closely?

Without a bore scope, it is a way to inspect a small part of the bore to see if there are burrs or chatter marks left in the bore when it was created or if the crown is damaged. It's just a check you can do when buying a rifle and can be one of many factors important if you are looking for sub MOA.

[fish_e_o]

I bought a rifle where the barrel was split from an obstructed bore. I cut the end off with a saw and it shot sub moa with factory ammo.

https://www.longrangehunting.com/art...ted-crown.670/

I believe that the crown tells almost no tale as to how a rifle shoots. I believe it may tell how it was cared for.

[Salavee]

Originally Posted by fish_e_o

I bought a rifle where the barrel was split from an obstructed bore. I cut the end off with a saw and it shot sub moa with factory ammo.

https://www.longrangehunting.com/art...ted-crown.670/

I believe that the crown tells almost no tale as to how a rifle shoots. I believe it may tell how it was cared for.

I think you were lucky in that case and managed a square cut.

[Full Curl Earl]

Damaged muzzles are a common result of inaccuracy. It’s the last thing that bullets going to touch before it leaves the rifle. If it’s been nicked by a rock, good luck with sub 3” let alone sub moa with a “sawed off” crown.
Typically, damaged muzzles from the field are fairly easy to see with the means others have posted here, but bad cleaning rod technique that has damaged the crown is a bit tougher to evaluate and usually is best done with a borescope.

[abbgdr]

It’s actually very easy to cut and re crown a barrel yourself. I’ve done it dozens of times over the years. You need a good small engineers square to square up the cut with a file after cutting with a hacksaw. I use a bolt with a large enough domed head to give an appropriate crown for the size of bore. I use lapping compound on the domed bolt head and put the threaded end in a cordless drill and start lapping a crown. I start with a corse grit and polish it off with fine grit and steel wool placed over the domed bolt head. I’ve also touched up suspect crowns using the same technique. That and a bedding job can turn a raggedy old clunker into a shooter. And I can have the cut/crown job finished in about half the time it takes me to drive to the nearest gun smith.

[AlbertaAl]

The crown tell the rifles history and if anyone knows anything about precision accuracy or rifle building they wil appreciate exploring the crown of a rifle. Factory crowns are virtually all similar in style...being a half rounded finish wheras most custom barrels will have a recessed crown.
Truck guns always have beat up crowns and no bluing left.