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I've seen more than a few barrels poorly done with a pipe cutter...the cutter bulges both the inside and the outside of the tip...you can correct it by deeply crowning the inside of the barrel and filing the outside, but it's more work than just cutting it properly in the first place.
Score a line with a pipe cutter...or even a knife blade...so you know where you want to finish to. A hacksaw will make short work of cutting through a barrel. Go slow and gentle, let the saw do the work. The cut won't be perfect...so finish with a file, again go slow and steady, key is to hold the barrel steady with a vice (or you can clamp it to a table and file up and down if you don't have a bench vice). I use the disc portion of my bench top sander...takes about 3seconds.
You can deburr the inside with a large drill bit...just spin/press the bit into the barrel by hand...it'll be enough to crown a brass barrel. Finish with a "cone" of fine wet/dry sandpaper (600-120grit). Straight and even is the key.
If you want to practice...cut it about and inch longer than your finished length, finish it off, inspect/shoot it and if it's all good, go for finished length.
Best of luck
Tys
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