BR is the best overall scoped rifle. PP comes in handy against vehicles and CQC (You can hear the Bolt Shot, so I avoid it) Grenade comes in handy against vehicles and for last ditch "kills from the grave" Thruster can be the most effective way of escaping and throwing off the enemy resupply is helpful because every player that has died is very likely to be carrying grenades great for multi kills and defending against waves of enemies (i.e. defending the flag)
The br is not the best scoped rifle, not even close. First off its sticky aim assist doesnt reach across maps like the dmr and most importantly the br doesnt aim head for you like dmr does. Cant tell you how many times the br misses headshots to the tip of the back of the head and even the front. While the dmr most noticeably in swat literally aims it self for head shots. Shoot people in the chest or sternum, HEAD SHOT.