When shooting the shotgun on gears of war should you use myaim button to be more accurate

Hmmmm...... well i get payed to play gears of war. I play in several tounements and i have won 3 of them... i use the shotgun all the time tho... I say that it depends on wut kinda shot u wana take. Like if your in a fite in close range i wudent use the aimer. But if you are behind cover and want to suprise the enemy id use the aimer