I would either try using a 1/4" downcut bit, or 1/8" downcut bit or a straight flute bit for that kind of work in that soft wood. They are not for punching holes though, there is nowhere for the chips to go but down into the hole. I use the 0.125in downcut bits for soft woods and an 0.063in straight cut bit for cutting the birch hobby plywood. Both leave a clean ( at least not splintered) edge if you have a good waste board supporting the cut.
2 Likes