From the Lyman Cast bullet book
An old Lyman cast bullet book shows the following for a 30-30.
With flat base (meaning not gas checked) 150 gr. bullets, Lyman lists the following.
With 2400 powder, from 1700 to 2180 fps, with 14 to 20 grains. 2400 powder is very adaptable for lighter loads.
With 4227 powder, 15 grs. for 1700, or 23 grs. for 2225 fps. (maximum load.)
20 grains of 4759 (maximum load) is shown as giving 1880 fps, while 15 grains is shown as 1700.
They show a max of 15 grains of Unique, for 1850.
When I poured my own bullets for use in a 30-06, I shot them right out of the mold, after hand lubing them. One mold was about 311 and another was about 313. They were actually more accurate than when sized to 308.
With the 30-30 I found the pressure went up if I didn't size them.
I am not advocating, or advising, that you use these loads in your rifle. I am just showing you what is in an old Lyman book.