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You're better off using a saw to make the cut.
While you can use a large pipe cutter, it tends to roll the end inward, and it takes a lot of filing to remove the rolled edge.
The best method is to mark the barrel where you want the cut to be.
Use tape wrapped around the barrel, or a small pipe cutter to LIGHTLY score a line around the barrel. Either gives you a cutting guide that's square with the barrel.
Use a fine-tooth hacksaw to make a light cut, then rotate the barrel and make another cut.
Continue rotating and making light cuts, until you have a shallow line cut all the way around the barrel.
Then continue rotating the barrel and making light cuts until the barrel is cut through.
This method keeps the cut square with the barrel, and eliminates having to do a lot of filing to square-up an uneven cut.
Then use a fine cut file to lightly bevel the sharp outer edge of the muzzle.
Use fine sand paper over the ball of your thumb to lightly bevel the inner edge of the muzzle.
Once the barrel is cut, there is NO choke left, and the gun is then a open Cylinder Bore.
The Cylinder Bore shoots slugs and buckshot nicely.
Older so called "riot" guns were Cylinder Bore, but newer guns usually have Improved Cylinder chokes which usually shoot slugs and buckshot a little better.
Of course in cutting a barrel down, you MUST be careful to keep the finished barrel AT LEAST 18" long, and better, make it 18 1/2" to prevent any chance of coming up short.
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