I like cast bullet #311291, 170-gr RN GC. A rather accurate bullet unsized for .303 Brit and 7.7 Jap, and sized to .308, fine for .30-30, .308 Win, and .30-06. Used to load it to practice with my Garand when I was on the Army level rifle team. Material cost: about 3 cents each.
You can also pick up inexpensive jacketed bullets (and powder) from the surplus component dealers listed in Shotgun News...Wideners, Jeff Bartlet, ect.
Midway and Graf & Sons also occasionally have sales, and I've picked up some good deals on EBAY.