Rick,
THE classic cast lead bullet for the .30-30 is the Lyman 311291, coming out at about 170 grains in #2 alloy.
The round-nose profile and crimping groove allows you to duplicate factory .30-30 cartridge length. The long boreriding surface makes for good chamber alignment and accuracy. My shooting friends and I have used this mold for nearly 30 years, and it is my favorite for the .30-30 Winchester. It has also proven very accurate in other .30 cartridges like the .300 Savage, .30-40 Krag, .30-06, .308 Winchester, etc.
For reduced loads ("MIDRANGE") in the larger .30 caliber cartridges, it is superb.
Size your bullets to 0.309" for the standard .308 groove diameter barrel. For other groove diameters, size to 0.001" larger than groove diameter.
You will NOT be disappointed!.