I have used 3 things, very fine blade hack saw, table saw as mentioned, and an angle grinder. One thing I don't like about the table saw is that is provides a lot of dust, since the wheels are 1/8" thick, that stuff is bad for you and your electrics: Ask the Serbs about nato's carbon chaff.

I now use one of those small hand angle grinder units, I think they are 4". A local shop sells abrasive wheels for these that are about 1/32" thick. I set up a 2x4 with this thing clamped to it, and with a moveable stop for the nock end. Whether using this unit or the table saw, a key factor is to feed the tube to the wheel so that the nock end lags, or at least is no more than parallel to the contact point. If the nock is in line with say the center of the wheel, then as you push the cuting end on the wheel, it will jam up the futher you push it in, you will also have a sholder that isn't square. I just touch the tube to the wheel , then spin it to cut and nip the fibers all arround, and keep spinning until the waste drops off.

I wouldn't use a pipe cutter, but I imagine that if you did, it would only work with shafts that have an Al core like ACC?