Fallout 4 Update 1.4: What’s New

Scrounger Perk Improved

Buried in the list of bug fixes and changes is this line: The Scrounger perk now includes additional common ammo types.

If you're not familiar with Scrounger, it helps you find additional ammo in searchable containers like lockers, desks, and cabinets. I don't use it personally but I know a few people that do. 

The 1.4 patch has improved the perk so that you can now find more ammo types. I'm hearing that it now includes .44 ammo as well as plasma rounds, fusion rounds, shotgun ammo, and 2mm rounds. 

Not bad, if you use Scrounger.