Having had to repair a few chair legs over the years, doweling is to me a fools errand, as even a slight misalignment of dowels, as often happens as the brad point drill follows the grain, yields either an incorrect fit on the surfaces to be glued, or an imperfect match of outside surfaces, which could be sanded and then you'd go down the rabbit hole of matching finishes
So, albiet anatheme to the "restoration" bibles, as often the break is in an are of angular grain, I took to boring a very slightlyoversized hole and inserting a metal rod slathered with epoxy, carpenters glue on the flat break areas, clamp and align- or vise-versa
Anyway, that's what i do
Eric