Pilot DAR>> If memory serves correctly, 250 is only for arrival. Checked the CARS... it's all right here> 602.32
YYZ (a couple years ago anyhow) also specify 250 for departures unless your a/c min clean speed is higher. I seem to recall Vancouver having a departure speed restriction of about 270kts to 8000ft. (something like that). On the climb out, think not only birds, but exposing yourself to less time in the congested lower level airspace.