I don't want to blow things up, I want them to still b in one piece, I also shoot rabbits and small varmints aswell, a .308 would demolish them

So will a 243.

There are two 7mm cartridges commonly available in a wide range of rifles and they are the 7mm-08 and 7mm Remington Magnum. The 7mm you were referring to was probably the 280 Remington. This is basically the same case as used in the 270 but uses .284 bullets (7mm) as opposed to .277 bullets (270). The 280 Remington is not widely available.

The 7mm-08 uses the same case as the 308 but it is necked to use 7mm (.284) bullets. Performance is very similar to the 308. The 7mm-08 shoots bullets that are a little bit lighter than generally used in the 308 and at slightly greater velocities.

The 7mm Remington Magnum is much more powerful and its recoil and muzzle blast is considerably greater than the 270.

Any of the centrefires calibres from 223 and up will blow a rabbit to pieces and will also take foxes apart.

Perhaps the ideal for you would be a 243 and a 22 rimfire