My Thoughts

.223 22 mag
.243 243 Win
.257 257 Wby
.264 6.5x55 SE
.277 (probably skip this oneand get a 7mm-08)
.284 7mm Rem Mag
.308 308 Win[/b]
.323 325 WSM
.338 338 Win Mag
.375 375 H&H
.416 416 Rigby
.458 458 Lott[/b]