Which end are you trying to cut off? The tapered end, or the
straight ‘handle’ end? Some drift punches have very long tapered
sections, and some have shortish tapered sections and long
’handles’. Which are yours?
If you’re just trying to hack off most of the handle end, yes, that
makes sense. But don’t cut the tapered part, that’ll be useful. If
you cut off the handled end, leave about 6" of it to grab in a vise.
Any smaller, and it gets hard to hang on to.
Hope that helps.