260 , 6.5 Japanese , 6.5-284 ,6.5-55 , 6.5-257 , 6.5 Mann (?) , 6.5-57 , 6.5-06' .... The Mann is the smaller 35 Rem , Carcano rim , but there's a couple more 6.5s plus wildcats and some weirdo using a 6.5 die to neck size 25s with no expander or something. There's a couple of 7s also that might use a .290 to get a ,295 OD and expand it back up to a .280-.282 ID . I have a 8-57 neck die that sizes .315 ID no expander to accommodate the obscure.318 7.92×57J .
7-08 , 284 , 7×57 , 280 Rem , 7×64 Brenkke, ....... I forget about all of the AIs .......
I have a set of 6.5-257 AI ish dies that make a great neck die for 25-06' . The RCBS die is only marked 6.5 on top.