I tried a bunch of calibers for deer and pigs before settling on the .308 about 20 years ago.Been my mainstay ever since.
If you ever get into 45/70..well let's just say it is highly addictive.Notice my tag line.
Between the .308 and the 45/70 I'm covered for anything.
I bought and installed a panel for my sliding glass door that has a built in doggie door so that the pups can come and go at will.What a neat contraption!!
As to the comparison between .270 and 30-06,the 30-06 has the greatest amount of bullet weights available.You can go from 125 grain bullets all the way to 225 grain.
Hot ad the dickens here today.

Stan in SC

The more I listen,the more I hear....and vice versa.

45/70,it's almost a religion.

If you have to take a second shot then you probably shouldn't have taken the first shot.