It is a good option, if your gunsmith has a reamer that fits your sizing die well then not so much.
If using multiple Gunsmiths then getting your own reamer that matches your sizer die will ensure you get the same chamber cut for each barrel. This assumes you will be re-barrelling yearly/regularly, or have multiple guns in that calibre.
If buying a reamer I would recommend looking at .268” or .269” neck dimension if a PPC using Lapua brass.