You probably won't find any other data for that bullet, because so few people use it in the .308 Win.
They don't use it in .308 WIN because (brace yourself) literally, there's no point!
Use the generic data for that weight bullet starting low and adjust as needed.
Not many 170gr slugs for .308 Win, so 180gr data can be a starting point, and will be "safer" than 150gr data,
The people doing the load data for the manuals don't, and can't list every possible combination of bullet and load. They tend to concentrate on the popular, most used bullets and loads for them.
Be aware that loading bullets made for the .30-30 into cases where they go significantly faster than 30-30 speeds changes the impact performance of the bullet, when speed reaches a certain point. For example, driving a .30-30 slug to 3000fps+ possible in a .300 magnum overdrives it, and it acts like a varmint bullet, almost literally "blowing up".
All expanding bullets have a range of speed inside which they work as intended. TO slow, little or no expansion. Too fast and violent "explosive" expansion, and as a result little penetration.
Call the bullet maker if you have questions, they'll happily tell you the speed limits you should stick between for best results.