Use the 165 PSPCL, that is. What you are going to run into here, is getting into bullets that are designed for higher velocity than you are going to have, and they won't expand. Pick a bullet 150gr or less, use a Nosler Ballistic Tip, or use a bullet designed for the .30-30 (round nosed, if you just have to have a 170gr). Do more than one!
From a 10" .30-30 (I have & use one, and like it a lot!) I would stick to a bullet between 125gr and 150gr. You will have enough velocity to get it to perform, and trajectory will be flatter. The specially designed single-shot pistol (ssp) bullets were made for this application.
Finally, consider the cost of your bullets against your total cash outlay. It is false economy, if not plain stupid, to scrimp on your bullet. It is the final stroke, to your whole effort. If that's not important, maybe you need to rethink some things. No flame intended, just some sound thinking.
FWIW, I use 150gr flat points that I cast myself (you wanna talk cheep bullets?) for most of my shooting,,,,,,Bug.