With peterson coming out with 270 n 300wsm brass hard to overlook either of those or the 7-270, 7-300wsm. It's good brass and will be available. In 270 an 8.5 or tighter will shoot the 170berger and 165 matrix In the 300 a 9 will shoot the new 230 sierra's and monos and a 10 will shoot 215 bergers and down. If you go 7-300 I would look at the 180's over the 195 just for mag feed.
The shermans in the different flavors are all fantastic short action rounds. If and when he has headstamped brass that is the better option for standard mag fed sa.