Crowning a shotgun barrel without a lathe.

Sheriff,

Get a Square lay it along the side of the Barrel and mark or scribe the Barrel. If you have a Machine Shop close go there and have them Mill the Barrel of to the Line you scribed or marked. They would probably do that for you for a few bucks. They can probably chamfer the Muzzle after Milling it.
Only an Idea! The other is by filing if there is only a small angle to correct but if it were mine I would go with suggestion number one. I have done file work on one a long time ago when I cut a barrel of to make a trunk gun it was a task.

03

 

You don't need a lathe. How much barrel do you have? 18" is the minimum. If you dont have 18" you have an SBS and a felony. Destroy it. If you have room recut the barrel with a rotating pipe/tubing cutter. They are cheap in hardware stores and will cut it evenly. Crowning is mostly a matter of removing the ridge which can be done with a cone shaped grinder or a step drill slowly.
If you don't have enough barrel length, cut a couple V notches in some wood and clamp the barrel short edge even with the wood. Start filing or grinding to square it up using the wood as a guide.

 

I just cut mine with a porta-band and knocked the burs with a half round file. When I cut it, it was for the intention of only using it inside the house so, it didn't have to be perfect. It ain't going to the turkey shoot.

 

How long is the barrel? Do not include the chamber! Not the overall lenght!

 

^? The length is measured from the breech face and includes the chamber. I have an 18.5" factory barrel and the measurement includes the chamber.
Close the breech. Stick a cleaning rod down the barrel all the way to the breech. Mark the cleaning rod and measure to the mark.

 

Wow!
Shotgun barrels are usually tapered, so using a square wont work.
Using a pipe cutter to cut the barrel can cause a restriction in the bore-something you DON'T want.
Shotgun barrels are measured from the closed breech face to the furthermost part of the barrel.

So- just eyeball it square with a file. Once you have filed it, chamfer the outside with the file. Chamfer the inside of the bore with a sharp pocket knife.
If you want to smooth it up, put a piece of wet/dry sandpaper on the floor, place the muzzle on it, and turn the barrel-keeping it vertical.

 

In my limited experience pipe cutters don't work so well on the tapered barrel.
I would measure from the breech end all around and hacksaw it, then file it nice and hit the inside with a steel tubing reamer.

 

I prefer to ere on the side of honesty rather the s

Oops, my bad I thought it was the opposite.