The Lyman Cast Bullet Handbook (3rd edition) lists a 160 grain gaschecked cast bullet loading table on page 191.
Suggested starting loads up to maximum loads follow:
RX7 23.0 grains up maximum of 39.0 grains
H4895 28.0 grains up to maximum of 45.0 grains
IMR-4064 29.0 grains up to maximum of 46.0 grains
IMR-4320 29.0 grains up to maximum of 46.0 grains
760 35.0 grains up to maximum of 50.0 grains
HTH
John