I HAVE ALWAYS Used the 150 Gr, but 170 will work just as well and even better in brushy areas,IMO.
Just 2 weeks ago I decided to take my trusty 30-30 Model 336SC which I have since 1980 and had not shot it since '82 , A calico doe came by the pond where I was just sitting in the brush, she was also in a brushy area but I figure where the shoulder was and let her have it with the 150 Gr, Remington Core lock" She dropped like someone hit her in the head, it is my second Calico doe and I'm glad I had that open site 30-30 for the quick shot.