as you' ve said, your hunting is from bench/bipods......and you' re not concerned about weight..... too much.

I' d opt for the #6 contour.

I own a .243 (m-70) Superrockchucker with a 26" #7 contour.......I sure wish it was a #5 instead. It' s strictly a varminter but it' s heavy even from a bench. Recoil is low but it' s still a lot of weight!!!...Your larger calibers could use a bit more weight!!

In the benchrest arena, the difference in " best" groups is very minor between unlimited rifles and featherweights. Heavier barrels don' t necessarily shoot better.....there' s a heck of a lot of little things that account for Accuracy.

The McMillan stock is a great choice!!