I'm going against the majority, but my choice, hands down, is the 7mm08. We re-barrel my DW's 243 to 7mm08. She always killed what she shot, but the trailing was generally longer with the 243. When the grandkids started shooting, they tried out the 7-08. Now they have their own.

This is a "easy" shooting caliber, also based on the 308 brass, that really can't be "outgrown".

I'm in the market for another A-Bolt in 7-08 now. Our youngest grand will be needing a rifle in a couple of years.