POW: Let's see - the 6mm Rem/243 are 308s necked to 6mm. The 307 is a rimmed 308. I don't know how the length of the 308/307 compares to the length of the old Savage 250-3000 but I'm wondering if that might not be in the ball park of what you might want - it is one heck of a cartridge. If you are looking to strictly wildcat, you could always go to a 6.5/07, which would be like shooting the 260 Remingon through a lever, and that would be on par with a 6.5 Swede and put you into that power range. The 6mm is a .243 bore, the 25 is halfway or so twixt the 6mm and the 6.5 (.264). I dunno if there is a 25/08, but I know the 25/06 is a real winner. This ought to be interesting. Mikey.