I am a fan of the 30/06, it may be a touch much for East TN whitetails but it has been effective. I can not warm up to a .270 Win, no idea why I just can't like'm. I shoot 130's from my 30/06 Ti and 180's from my Ruger MKII when I use the 30/06.
From looking around
270 Win with a 150 has around 16lbs recoil 30/06 with a 150 has around 17.5lbs recoil 30/06 with a 180 has around 19.5lbs recoil My 20 gauge with a 3" turkey load has over 30lbs recoil My 12 gauge with a 3" turkey load has over 50lbs recoil
I don't really think a 30/06 is a good 1st gun for a kid unless they can get some good reduced loads but I've not seen an adult that can't handle one.
I mainly shoot my .243 Win for everything now though.