Braves backers, Aaron watchers, and fans in general are pondering the firm probability that Hank Aaron (RF) will bash out his 500th home run in this 1968 season. Old inhabitant of the National League All-Star roster, four times leader of the League in RBI's, three times league leader in slugging average, etc. etc. Aaron, after thirteen years with the Milwaukee/ Atlanta Braves, allows himself a regal look backward with journalist Furman Bishop monitoring the lape. Not surprisingly, Aaron would rather talk baseball than anything else, although some personal details and color line problems take a few tight-lipped curves. Managers--inspiring-to-dim--receive absorbed attention: his admired Jacksonville mentor, Ben Geraghty; Fred Haney, tough and controversial; Bobby Bragen, to whom Aaron gives credit for pushing him to be the ""complete"" ballplayer: Charlie Dressen, who walked out on the field with shoelaces on fire; and others. Remarkably decisive in play, Hank Aaron is apt to bobble events and ramble, but for dugout doings and shower gossip this is a reliable utility performance.