Here's the all-time list as of the start of the 2008 season:
CAREER
AT BATS >= 500
AVERAGE AVG AB
1 Jeff Cirillo .307 3259
2 Paul Molitor .303 7520
3 Cecil Cooper .302 6019
4 Kevin Seitzer .300 1993
5 Darryl Hamilton .290 2193
6 Mark Loretta .289 2596
7 Lyle Overbay .289 1116
8 Dave Parker .289 610
9 Fernando Vina .286 1957
10 Robin Yount .285 11008
11 Dave Nilsson .284 2779
12 Corey Hart .284 800
13 Brady Clark .284 1682
14 George Scott .283 3009
15 Prince Fielder .280 1201
16 Tyler Houston .279 774
17 Alex Sanchez .278 625
18 Geoff Jenkins .277 4407
19 Ben Oglivie .277 4136
20 Richie Sexson .276 1987
21 Scott Podsednik .276 1198
22 Larry Hisle .276 794
23 Sixto Lezcano .275 2722
24 Jim Gantner .274 6189
25 B.J. Surhoff .274 3884
26 Carlos Lee .273 1006
27 Eric Young .271 900
28 Don Money .270 4330
29 Wes Helms .268 918
30 John Jaha .268 2176
31 Ernest Riles .265 1375
32 Jesse Levis .264 503
33 Tommy Harper .264 1726
34 Dick Davis .264 969
35 Bill Hall .264 2058
36 Von Joshua .264 959
37 J.J. Hardy .263 1092
38 Ron Belliard .263 1686
39 Charlie Moore .262 3926
40 Ted Simmons .262 2544
41 Greg Brock .261 1696
42 Jose Hernandez .261 1513
43 Dante Bichette .261 832
44 Marquis Grissom .260 1740
45 Jim Wohlford .260 684
46 Matt Mieske .260 1211
47 Dave May .259 2521
48 Marc Newfield .259 522
49 Gary Sheffield .259 1110
50 Mark Brouhard .259 909
51 Jeromy Burnitz .258 2768
52 John Briggs .258 1909
53 Keith Ginter .257 820
54 Damian Miller .257 902
55 Pat Listach .256 1640
56 Bill Spiers .256 1692
57 Ellie Rodriguez .255 964
58 Glenn Braggs .255 1619
59 Ed Romero .254 1167
60 Roy Howell .253 902
61 Bill Sharp .251 553
62 Bob Heise .251 558
63 Sal Bando .250 1915
64 Rickie Weeks .249 1140
65 Mike Hegan .249 1529
66 Jeffrey Hammonds .248 660
67 Ron Theobald .248 779
68 Mike Felder .247 1133
69 Greg Vaughn .246 3244
70 Gerald Williams .246 658
71 Bill Schroeder .246 1066
72 Ted Kubiak .244 800
73 Danny Walton .244 558
74 Dale Sveum .243 1702
75 Jerry McNertney .242 706
76 Raul Casanova .241 510
77 Jose Valentin .240 2409
78 Roberto Pena .238 690
79 Rick Manning .237 1251
80 Buck Martinez .235 671
81 Bobby Mitchell .235 587
82 Craig Counsell .233 755
83 Turner Ward .233 563
84 Hank Aaron .232 736
85 Mike Matheny .231 1172
86 Gorman Thomas .230 3544
87 Darrell Porter .229 1706
88 Rob Deer .229 2338
89 Tim Johnson .225 1104
90 Pedro Garcia .224 1440
91 Joe Lahoud .224 541
92 Henry Blanco .222 598
93 Bob Coluccio .221 894
94 Franklin Stubbs .220 650
95 Rick Auerbach .213 800
96 Chad Moeller .204 614
Babe Ruth's career batting average was .342.
Ivan Rodriguez has a career batting average of .298.
Wade Boggs had a career batting average of .328 and Don Mattingly had a career batting average of .307.
As of 2009 Robinson Cano has a career batting average of .306
Keith Hernandez had a career batting average of .296. He had 2,182 career hits in 7,370 career at bats.
Babe Ruth had a career batting average of .342 with 8,398 at bats.
Willie Mays had a career batting average of .302, 3,283 hits in 10,881 at bats.
Through August 12, 2016, Alex Rodriguez has a career batting average of .295.
Jeff Cirillo at .307. Cirillo played 978 games for the Brewers between 1994-1999 and 2005-2006 and had totals of 1000 base hits in 3259 at bats with 73 home runs and 418 RBIs.
Sammy Sosa had a career batting average of .273.
Hank Aaron had a career batting average of .305 (3,771 base hits in 12,364 at bats).
Pete Rose's career batting average was .303 (4,256 base hits on 14,053 at bats).