7mm and bigger for me.
For the recoil.
A lot people dont know that shape of stock have a lot part of the recoil.
And I know from experience ,if You put good soft ruber(limsaver 1") on the end of stock it help a lot.
I have on all my magnum rifle brake and good recoil pad and that is way to go.
I have ,not to long ago, problem with recoil in my 375HH.
Scope is sliping and it was not pleasent to shoot.
First I was put brake on it and it helped a lot ,but still it not pleasent to shoot ,why not ,because the recoil pad is hard as a rock yes it was thick over 1" but it was rooock.
And when I change it ,rifle is finnaly pleasent to shoot.