BLR is a great rifle in either caliber. I like the 308Win. myself. Have owned/traded approx. six of 'em, and have two now. Never found it wanting on game, and all were
very accurate.
As to convincing the wife, might try making a note of the cost of the new rifle/scope you want. Then add up the lbs. of meat you should be able to take in one season assuming
just one antelope, one or two deer, and an elk. Figure the cost of the meat. It should get her attention (just don't mention incidentals like ammo, gas/oil for the PU, lodging, meals, etc. on the hunt

)