Is vacant non owner occupied a good seller list?

[Mardochee Augustin]

I have list from PropStream which is vacant non owner occupied. However most calls go straight to voice mail. And the ones that do answer aren’t interested in selling. So the question I have is my list not working and start a new one? Or should I go through the list completely then try to call the ones that go straight to voicemail the second time

I go through the list? I am not using a dialer I’m doing the cold calls manually. List has about 500 addresses.