7mm-08's alright. It shines with the high BC projectiles. If you're handloading and re-tooling for a new 7mm cartridge, consider the 7mm WTO or the 7mm-08 ackley (pretty much the same thing). The 7mmAI will still work for off-the-shelf ammo and when you reload the fireformed cases, then you can wring out the performance with additional case capacity.
If you already have the magnum bolt face action, then consider the 7mm SAUM or a 7mm Sherman Short Mag. You can down-load them for better-than-7mm-08 performance or run it hot for shooting a mile.