jphendren:
Varmint and Small Game Rifles and Cartridges, Revised and Expanded Edition, 2001, Wolfe Publishing, ISBN 1-879-356-33-3. On pages 56 through 59 you will find Jim Carmichel's 1970 article "Cast Bullets in the .222 Rem." Carmichel explains in some detail what he did, but gives no group measurements for 100 yards or farther. He does mention one-inch groups at 50 yards being sufficient for close range small game hunting, but also mentions groups at 100 yards without specifying group sizes.
Carmichel has a 1969 article "Cast Bullet Loads for the Sixes" on pages 134 through 136 of that same volume. I suggest it because he discusses some details of load development that he omitted in his 1970 article.
I recommend the articles because Carmichel is one of the gunwriters in whom I have long had confidence. I have no experience casting bullets or working up rifle loads for cast bullets.