The problem is reloads and pummel fixes that. Brazen is a non starter for PvE especially with the tu23 reload nerfs (why??). The only thing that might have been better would have been determined but that's not an option.
Hmmmm, interesting! A potential alternative to determined… Tried running headshot dmg with my custom 870 in the past but it was never consistent. Also, the enforcer is my single most favourite shotgun in the game, wish they’d make it available to new players, it’s reliable!
Headhunter fury is not a new build and has been around since before this season, and modifier or changes to base shotgun damage. It's a popular speed running strat (also regulus).