If you're looking for a good off-the-shelf
load, you may want to try the Hornady
154 grain spire point cartridge. It's done a good job for me with antelope, caribou, mule deer, whitetail, prairie dogs and coyote.
I too have a Browning A-Bolt (pre BOSS)
and I have 3 shot groups at 200 yards that are under an inch.
Good luck - you'll enjoy that rifle.